diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-04-17 21:17:39.748645280 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-04-17 21:17:39.792645218 +0000
@@ -0,0 +1 @@
+tsprintf-thousands
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-01-06 10:55:57.000000000 +0000
+++ mpfr-4.2.0-b/VERSION	2023-04-17 21:17:39.792645218 +0000
@@ -1 +1 @@
-4.2.0
+4.2.0-p1
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-01-06 10:55:57.000000000 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-04-17 21:17:39.788645224 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0"
+#define MPFR_VERSION_STRING "4.2.0-p1"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-01-06 10:55:57.000000000 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-04-17 21:17:39.792645218 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0";
+  return "4.2.0-p1";
 }
diff -Naurd mpfr-4.2.0-a/tests/tsprintf.c mpfr-4.2.0-b/tests/tsprintf.c
--- mpfr-4.2.0-a/tests/tsprintf.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tsprintf.c	2023-04-17 21:17:39.784645229 +0000
@@ -1715,7 +1715,25 @@
   check_sprintf ("000000001,000", "%'013.4Rg", x);
 
 #ifdef PRINTF_GROUPFLAG
-  check_vsprintf ("+01,234,567  :", "%0+ -'13.10Pd:", (mpfr_prec_t) 1234567);
+  /* Do not test the thousands separator with a precision field larger
+     than the number of digits (thus needing leading zeros), such as
+     "%0+ -'13.10Pd:" (used up to MPFR 4.2.0), since the GNU libc is
+     buggy: https://sourceware.org/bugzilla/show_bug.cgi?id=23432
+     We don't know about the other implementations.
+     This new test works fine with glibc up to 2.36, but fails with 2.37
+     (as reported by Klaus Dittrich in the MPFR mailing-list); this is
+     actually a bug introduced in glibc 2.37, not in MPFR:
+       https://sourceware.org/bugzilla/show_bug.cgi?id=30068
+     Since this bug can yield a buffer overflow (CVE-2023-25139), possibly
+     affecting MPFR users, let us rather require a fix in glibc. This bug
+     has been fixed in the 2.37 branch:
+       https://sourceware.org/git/?p=glibc.git;a=commit;h=07b9521fc6
+     If we wanted to check that and avoid a failure of the test because of
+     a buggy C library (while MPFR would be consistent with the C library),
+     we could compare the MPFR output with both the correct output and the
+     output from the C library (possibly buggy). But to do that in a clean
+     way, this would require a change in the check_vsprintf() call. */
+  check_vsprintf ("+1,234,567   :", "%0+ -'13Pd:", (mpfr_prec_t) 1234567);
 #endif
 
   mpfr_clear (x);
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-04-17 21:18:00.464616127 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-04-17 21:18:00.512616059 +0000
@@ -0,0 +1 @@
+ui_pow_ui-overflow
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-04-17 21:17:39.792645218 +0000
+++ mpfr-4.2.0-b/VERSION	2023-04-17 21:18:00.512616059 +0000
@@ -1 +1 @@
-4.2.0-p1
+4.2.0-p2
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-04-17 21:17:39.788645224 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-04-17 21:18:00.508616065 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p1"
+#define MPFR_VERSION_STRING "4.2.0-p2"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/ui_pow_ui.c mpfr-4.2.0-b/src/ui_pow_ui.c
--- mpfr-4.2.0-a/src/ui_pow_ui.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/src/ui_pow_ui.c	2023-04-17 21:18:00.504616070 +0000
@@ -23,7 +23,7 @@
 #include "mpfr-impl.h"
 
 int
-mpfr_ui_pow_ui (mpfr_ptr x, unsigned long int y, unsigned long int n,
+mpfr_ui_pow_ui (mpfr_ptr x, unsigned long int k, unsigned long int n,
                 mpfr_rnd_t rnd)
 {
   mpfr_exp_t err;
@@ -35,22 +35,28 @@
   MPFR_ZIV_DECL (loop);
   MPFR_SAVE_EXPO_DECL (expo);
 
+  MPFR_LOG_FUNC
+    (("k=%lu n=%lu rnd=%d", k, n, rnd),
+     ("y[%Pu]=%.*Rg inexact=%d",
+      mpfr_get_prec (x), mpfr_log_prec, x, inexact));
+
   if (MPFR_UNLIKELY (n <= 1))
     {
       if (n == 1)
-        return mpfr_set_ui (x, y, rnd);     /* y^1 = y */
+        return mpfr_set_ui (x, k, rnd);     /* k^1 = k */
       else
-        return mpfr_set_ui (x, 1, rnd);     /* y^0 = 1 for any y */
+        return mpfr_set_ui (x, 1, rnd);     /* k^0 = 1 for any k */
     }
-  else if (MPFR_UNLIKELY (y <= 1))
+  else if (MPFR_UNLIKELY (k <= 1))
     {
-      if (y == 1)
+      if (k == 1)
         return mpfr_set_ui (x, 1, rnd);     /* 1^n = 1 for any n > 0 */
       else
         return mpfr_set_ui (x, 0, rnd);     /* 0^n = 0 for any n > 0 */
     }
 
-  for (size_n = 0, m = n; m; size_n++, m >>= 1);
+  for (size_n = 0, m = n; m != 0; size_n++, m >>= 1)
+    ;
 
   MPFR_SAVE_EXPO_MARK (expo);
   prec = MPFR_PREC (x) + 3 + size_n;
@@ -60,23 +66,55 @@
   for (;;)
     {
       int i = size_n;
+      unsigned int inex_res;
 
-      inexact = mpfr_set_ui (res, y, MPFR_RNDU);
+      inex_res = mpfr_set_ui (res, k, MPFR_RNDU);
       err = 1;
       /* now 2^(i-1) <= n < 2^i: i=1+floor(log2(n)) */
       for (i -= 2; i >= 0; i--)
         {
-          inexact |= mpfr_sqr (res, res, MPFR_RNDU);
+          inex_res |= mpfr_sqr (res, res, MPFR_RNDU);
           err++;
           if (n & (1UL << i))
-            inexact |= mpfr_mul_ui (res, res, y, MPFR_RNDU);
+            inex_res |= mpfr_mul_ui (res, res, k, MPFR_RNDU);
         }
+
+      if (MPFR_UNLIKELY (MPFR_IS_INF (res)))
+        {
+          mpfr_t kf;
+          mpz_t z;
+          int size_k;
+          MPFR_BLOCK_DECL (flags);
+
+          /* Let's handle the overflow by calling mpfr_pow_z.
+             Alternatively, we could call mpfr_pow_ui; this would
+             need a bit shorter code below, but mpfr_pow_ui handles
+             the overflow by calling mpfr_pow_z, so that calling
+             mpfr_pow_z directly should be a bit more efficient. */
+
+          MPFR_ZIV_FREE (loop);
+          mpfr_clear (res);
+          for (size_k = 0, m = k; m != 0; size_k++, m >>= 1)
+            ;
+          mpfr_init2 (kf, size_k);
+          inexact = mpfr_set_ui (kf, k, MPFR_RNDN);
+          MPFR_ASSERTD (inexact == 0);
+          mpz_init (z);
+          mpz_set_ui (z, n);
+          MPFR_BLOCK (flags, inexact = mpfr_pow_z (x, kf, z, rnd););
+          mpz_clear (z);
+          mpfr_clear (kf);
+          MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, flags);
+          goto end;
+        }
+
       /* since the loop is executed floor(log2(n)) times,
          we have err = 1+floor(log2(n)).
          Since prec >= MPFR_PREC(x) + 4 + floor(log2(n)), prec > err */
       err = prec - err;
 
-      if (MPFR_LIKELY (inexact == 0
+      MPFR_LOG_VAR (res);
+      if (MPFR_LIKELY (!inex_res
                        || MPFR_CAN_ROUND (res, err, MPFR_PREC (x), rnd)))
         break;
 
@@ -90,6 +128,7 @@
 
   mpfr_clear (res);
 
+ end:
   MPFR_SAVE_EXPO_FREE (expo);
   return mpfr_check_range (x, inexact, rnd);
 }
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-04-17 21:17:39.792645218 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-04-17 21:18:00.512616059 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p1";
+  return "4.2.0-p2";
 }
diff -Naurd mpfr-4.2.0-a/tests/tlog10.c mpfr-4.2.0-b/tests/tlog10.c
--- mpfr-4.2.0-a/tests/tlog10.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tlog10.c	2023-04-17 21:18:00.504616070 +0000
@@ -49,6 +49,60 @@
 #define TEST_RANDOM_POS 8
 #include "tgeneric.c"
 
+/* On 2023-02-13, one gets an infinite loop in mpfr_log10 on both
+   32-bit and 64-bit hosts when the precision is not large enough
+   (precision 12 and below). */
+static void
+bug20230213 (void)
+{
+  mpfr_exp_t old_emin, old_emax, e;
+  mpfr_t t, x, y0, y1, y2;
+  int prec;
+
+  old_emin = mpfr_get_emin ();
+  old_emax = mpfr_get_emax ();
+
+  set_emin (MPFR_EMIN_MIN);
+  set_emax (MPFR_EMAX_MAX);
+  e = mpfr_get_emax () - 1;
+
+  /* The precisions of t and y0 should be large enough to avoid
+     a hard-to-round case for the target precisions. */
+  mpfr_inits2 (64, t, y0, (mpfr_ptr) 0);
+  mpfr_set_exp_t (y0, e, MPFR_RNDN);
+  mpfr_log_ui (t, 10, MPFR_RNDN);
+  mpfr_div (y0, y0, t, MPFR_RNDN);
+  mpfr_log_ui (t, 2, MPFR_RNDN);
+  mpfr_mul (y0, y0, t, MPFR_RNDN);
+
+  for (prec = 16; prec >= MPFR_PREC_MIN; prec--)
+    {
+      mpfr_inits2 (prec, x, y1, y2, (mpfr_ptr) 0);
+      mpfr_set (y1, y0, MPFR_RNDN);
+
+      mpfr_set_ui_2exp (x, 1, e, MPFR_RNDN);
+      mpfr_log10 (y2, x, MPFR_RNDN);
+      MPFR_ASSERTN (MPFR_IS_PURE_FP (y2));
+      MPFR_ASSERTN (MPFR_IS_POS (y2));
+
+      if (! mpfr_equal_p (y1, y2))
+        {
+          printf ("Error in bug20230213.\n");
+          printf ("Expected ");
+          mpfr_dump (y1);
+          printf ("Got      ");
+          mpfr_dump (y2);
+          exit (1);
+        }
+      mpfr_clears (x, y1, y2, (mpfr_ptr) 0);
+    }
+
+  mpfr_clears (t, y0, (mpfr_ptr) 0);
+
+  set_emin (old_emin);
+  set_emax (old_emax);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -112,6 +166,8 @@
   mpfr_clear (x);
   mpfr_clear (y);
 
+  bug20230213 ();
+
   data_check ("data/log10", mpfr_log10, "mpfr_log10");
 
   tests_end_mpfr ();
diff -Naurd mpfr-4.2.0-a/tests/tui_pow.c mpfr-4.2.0-b/tests/tui_pow.c
--- mpfr-4.2.0-a/tests/tui_pow.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tui_pow.c	2023-04-17 21:18:00.504616070 +0000
@@ -142,6 +142,37 @@
   mpfr_clear (t);
 }
 
+static void
+huge (void)
+{
+  mpfr_exp_t old_emin, old_emax;
+  mpfr_t x;
+
+  old_emin = mpfr_get_emin ();
+  old_emax = mpfr_get_emax ();
+
+  set_emin (MPFR_EMIN_MIN);
+  set_emax (MPFR_EMAX_MAX);
+
+  mpfr_init2 (x, 8);
+
+  /* The purpose of this test is more to check that mpfr_ui_pow_ui
+     terminates (without taking much memory) rather than checking
+     the value of x. On 2023-02-13, the +Inf case was not handled
+     in the Ziv iteration, yielding an infinite loop, affecting
+     mpfr_log10 in particular. See
+       commit 90de094f0d9c309daca707aa227470d810866616
+  */
+  mpfr_ui_pow_ui (x, 5, ULONG_MAX, MPFR_RNDN);
+  if (MPFR_EMAX_MAX <= ULONG_MAX)  /* true with default _MPFR_EXP_FORMAT */
+    MPFR_ASSERTN (MPFR_IS_INF (x));
+
+  mpfr_clear (x);
+
+  set_emin (old_emin);
+  set_emax (old_emax);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -180,6 +211,7 @@
     }
 
   test1 ();
+  huge ();
 
   {
   mpfr_t z, t;
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-04-17 21:18:26.860579184 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-04-17 21:18:26.904579122 +0000
@@ -0,0 +1 @@
+multibyte-decimal_point
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-04-17 21:18:00.512616059 +0000
+++ mpfr-4.2.0-b/VERSION	2023-04-17 21:18:26.904579122 +0000
@@ -1 +1 @@
-4.2.0-p2
+4.2.0-p3
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-04-17 21:18:00.508616065 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-04-17 21:18:26.900579128 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p2"
+#define MPFR_VERSION_STRING "4.2.0-p3"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-04-17 21:18:00.512616059 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-04-17 21:18:26.904579122 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p2";
+  return "4.2.0-p3";
 }
diff -Naurd mpfr-4.2.0-a/tests/tfprintf.c mpfr-4.2.0-b/tests/tfprintf.c
--- mpfr-4.2.0-a/tests/tfprintf.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tfprintf.c	2023-04-17 21:18:26.896579133 +0000
@@ -61,6 +61,12 @@
       exit (1);                                                         \
     }
 
+#if MPFR_LCONV_DPTS
+#define DPLEN ((int) strlen (localeconv()->decimal_point))
+#else
+#define DPLEN 1
+#endif
+
 /* limit for random precision in random() */
 const int prec_max_printf = 5000;
 
@@ -195,12 +201,12 @@
                   lo, &ulo);
   check_length (2, ulo, 36, lu);
   check_vfprintf (fout, "a. %hi, b. %*f, c. %Re%hn", ush, 3, f, mpfr, &ush);
-  check_length (3, ush, 46, hu);
+  check_length (3, ush, 45 + DPLEN, hu);
   check_vfprintf (fout, "a. %hi, b. %f, c. %#.2Rf%n", sh, d, mpfr, &i);
-  check_length (4, i, 29, d);
+  check_length (4, i, 28 + DPLEN, d);
   check_vfprintf (fout, "a. %R*A, b. %Fe, c. %i%zn", rnd, mpfr, mpf, sz,
                   &sz);
-  check_length (5, (unsigned long) sz, 34, lu); /* no format specifier "%zu" in C90 */
+  check_length (5, (unsigned long) sz, 33 + DPLEN, lu); /* no format specifier "%zu" in C90 */
   check_vfprintf (fout, "a. %Pu, b. %c, c. %Zi%Zn", prec, ch, mpz, &mpz);
   check_length_with_cmp (6, mpz, 17, mpz_cmp_ui (mpz, 17), Zi);
   check_vfprintf (fout, "%% a. %#.0RNg, b. %Qx%Rn, c. %p", mpfr, mpq, &mpfr,
@@ -224,7 +230,7 @@
 
 #ifdef PRINTF_L
   check_vfprintf (fout, "a. %RA, b. %Lf, c. %QX%zn", mpfr, ld, mpq, &sz);
-  check_length (9, (unsigned long) sz, 30, lu); /* no format specifier "%zu" in C90 */
+  check_length (9, (unsigned long) sz, 29 + DPLEN, lu); /* no format specifier "%zu" in C90 */
 #endif
 
 #ifndef NPRINTF_HH
diff -Naurd mpfr-4.2.0-a/tests/tprintf.c mpfr-4.2.0-b/tests/tprintf.c
--- mpfr-4.2.0-a/tests/tprintf.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tprintf.c	2023-04-17 21:18:26.896579133 +0000
@@ -68,6 +68,12 @@
       exit (1);                                                         \
     }
 
+#if MPFR_LCONV_DPTS
+#define DPLEN ((int) strlen (localeconv()->decimal_point))
+#else
+#define DPLEN 1
+#endif
+
 /* limit for random precision in random() */
 const int prec_max_printf = 5000;
 /* boolean: is stdout redirected to a file ? */
@@ -316,11 +322,11 @@
   check_vprintf ("a. %c, b. %Rb, c. %u, d. %li%ln", i, mpfr, i, lo, &ulo);
   check_length (2, ulo, 36, lu);
   check_vprintf ("a. %hi, b. %*f, c. %Re%hn", ush, 3, f, mpfr, &ush);
-  check_length (3, ush, 46, hu);
+  check_length (3, ush, 45 + DPLEN, hu);
   check_vprintf ("a. %hi, b. %f, c. %#.2Rf%n", sh, d, mpfr, &i);
-  check_length (4, i, 29, d);
+  check_length (4, i, 28 + DPLEN, d);
   check_vprintf ("a. %R*A, b. %Fe, c. %i%zn", rnd, mpfr, mpf, sz, &sz);
-  check_length (5, (unsigned long) sz, 34, lu); /* no format specifier '%zu' in C90 */
+  check_length (5, (unsigned long) sz, 33 + DPLEN, lu); /* no format specifier '%zu' in C90 */
   check_vprintf ("a. %Pu, b. %c, c. %RUG, d. %Zi%Zn", prec, ch, mpfr, mpz, &mpz);
   check_length_with_cmp (6, mpz, 24, mpz_cmp_ui (mpz, 24), Zi);
   check_vprintf ("%% a. %#.0RNg, b. %Qx%Rn c. %p",
@@ -344,7 +350,7 @@
 
 #ifdef PRINTF_L
   check_vprintf ("a. %RA, b. %Lf, c. %QX%zn", mpfr, ld, mpq, &sz);
-  check_length (9, (unsigned long) sz, 30, lu); /* no format specifier '%zu' in C90 */
+  check_length (9, (unsigned long) sz, 29 + DPLEN, lu); /* no format specifier '%zu' in C90 */
 #endif
 
 #ifndef NPRINTF_HH
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-04-17 21:19:01.988530337 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-04-17 21:19:02.032530276 +0000
@@ -0,0 +1 @@
+rec_sqrt-zivloop
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-04-17 21:18:26.904579122 +0000
+++ mpfr-4.2.0-b/VERSION	2023-04-17 21:19:02.032530276 +0000
@@ -1 +1 @@
-4.2.0-p3
+4.2.0-p4
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-04-17 21:18:26.900579128 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-04-17 21:19:02.032530276 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p3"
+#define MPFR_VERSION_STRING "4.2.0-p4"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/rec_sqrt.c mpfr-4.2.0-b/src/rec_sqrt.c
--- mpfr-4.2.0-a/src/rec_sqrt.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/src/rec_sqrt.c	2023-04-17 21:19:02.024530287 +0000
@@ -463,6 +463,7 @@
   int s, cy, inex;
   mpfr_limb_ptr x;
   MPFR_TMP_DECL(marker);
+  MPFR_ZIV_DECL (loop);
 
   MPFR_LOG_FUNC
     (("x[%Pu]=%.*Rg rnd=%d", mpfr_get_prec (u), mpfr_log_prec, u, rnd_mode),
@@ -530,6 +531,7 @@
   wp = rp + 11;
   if (wp < rn * GMP_NUMB_BITS)
     wp = rn * GMP_NUMB_BITS;
+  MPFR_ZIV_INIT (loop, wp);
   for (;;)
     {
       MPFR_TMP_MARK (marker);
@@ -561,8 +563,9 @@
         }
       MPFR_TMP_FREE(marker);
 
-      wp += GMP_NUMB_BITS;
+      MPFR_ZIV_NEXT (loop, wp);
     }
+  MPFR_ZIV_FREE (loop);
   cy = mpfr_round_raw (MPFR_MANT(r), x, wp, 0, rp, rnd_mode, &inex);
   MPFR_EXP(r) = - (MPFR_EXP(u) - 1 - s) / 2;
   if (MPFR_UNLIKELY(cy != 0))
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-04-17 21:18:26.904579122 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-04-17 21:19:02.032530276 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p3";
+  return "4.2.0-p4";
 }
diff -Naurd mpfr-4.2.0-a/tests/trec_sqrt.c mpfr-4.2.0-b/tests/trec_sqrt.c
--- mpfr-4.2.0-a/tests/trec_sqrt.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/trec_sqrt.c	2023-04-17 21:19:02.028530282 +0000
@@ -242,6 +242,8 @@
   data_check ("data/rec_sqrt", mpfr_rec_sqrt, "mpfr_rec_sqrt");
   bad_cases (mpfr_rec_sqrt, pm2, "mpfr_rec_sqrt", 0, -256, 255, 4, 128,
              800, 50);
+  bad_cases (mpfr_rec_sqrt, pm2, "mpfr_rec_sqrt", 0, -256, 255, 9999, 9999,
+             120000, 1);
 
  end:
   tests_end_mpfr ();
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-05-12 15:05:00.989811960 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-05-12 15:05:01.085811835 +0000
@@ -0,0 +1 @@
+reldiff
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-04-17 21:19:02.032530276 +0000
+++ mpfr-4.2.0-b/VERSION	2023-05-12 15:05:01.085811835 +0000
@@ -1 +1 @@
-4.2.0-p4
+4.2.0-p5
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-04-17 21:19:02.032530276 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-05-12 15:05:01.077811846 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p4"
+#define MPFR_VERSION_STRING "4.2.0-p5"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/reldiff.c mpfr-4.2.0-b/src/reldiff.c
--- mpfr-4.2.0-a/src/reldiff.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/src/reldiff.c	2023-05-12 15:05:01.069811856 +0000
@@ -30,31 +30,25 @@
 
   if (MPFR_ARE_SINGULAR (b, c))
     {
-      if (MPFR_IS_NAN(b) || MPFR_IS_NAN(c))
-        {
-          MPFR_SET_NAN(a);
-          return;
-        }
-      else if (MPFR_IS_INF(b))
+      if (MPFR_IS_NAN (b) || MPFR_IS_INF (b) || MPFR_IS_NAN (c) ||
+          (MPFR_IS_ZERO (b) && MPFR_IS_ZERO (c)))
         {
-          if (MPFR_IS_INF (c) && (MPFR_SIGN (c) == MPFR_SIGN (b)))
-            MPFR_SET_ZERO(a);
-          else
-            MPFR_SET_NAN(a);
+          MPFR_SET_NAN (a);
           return;
         }
-      else if (MPFR_IS_INF(c))
+      if (MPFR_IS_ZERO (b) || MPFR_IS_INF (c))
         {
           MPFR_SET_SAME_SIGN (a, b);
           MPFR_SET_INF (a);
           return;
         }
-      else if (MPFR_IS_ZERO(b)) /* reldiff = abs(c)/c = sign(c) */
-        {
-          mpfr_set_si (a, MPFR_INT_SIGN (c), rnd_mode);
-          return;
-        }
-      /* Fall through */
+      /* The case c = 0 with b regular, which should give sign(b) exactly,
+         cannot be optimized here as it is documented in the MPFR manual
+         that this function just computes abs(b-c)/b using the precision
+         of a and the rounding mode rnd_mode for all operations. So let's
+         prefer the potentially "incorrect" result. Note that the correct
+         result is not necessarily better because if could break properties
+         (like monotonicity?) implied by the documentation. */
     }
 
   if (a == b)
@@ -64,8 +58,8 @@
     }
 
   mpfr_sub (a, b, c, rnd_mode);
-  mpfr_abs (a, a, rnd_mode); /* for compatibility with MPF */
-  mpfr_div (a, a, (a == b) ? b_copy : b, rnd_mode);
+  MPFR_SET_SIGN (a, 1);
+  mpfr_div (a, a, a == b ? b_copy : b, rnd_mode);
 
   if (a == b)
     mpfr_clear (b_copy);
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-04-17 21:19:02.032530276 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-05-12 15:05:01.081811839 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p4";
+  return "4.2.0-p5";
 }
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-05-12 15:06:11.789722083 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-05-12 15:06:11.885721962 +0000
@@ -0,0 +1 @@
+tests-reuse
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-05-12 15:05:01.085811835 +0000
+++ mpfr-4.2.0-b/VERSION	2023-05-12 15:06:11.885721962 +0000
@@ -1 +1 @@
-4.2.0-p5
+4.2.0-p6
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-05-12 15:05:01.077811846 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-05-12 15:06:11.877721972 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p5"
+#define MPFR_VERSION_STRING "4.2.0-p6"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-05-12 15:05:01.081811839 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-05-12 15:06:11.885721962 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p5";
+  return "4.2.0-p6";
 }
diff -Naurd mpfr-4.2.0-a/tests/reuse.c mpfr-4.2.0-b/tests/reuse.c
--- mpfr-4.2.0-a/tests/reuse.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/reuse.c	2023-05-12 15:06:11.869721983 +0000
@@ -78,22 +78,16 @@
       mpfr_const_pi (x, MPFR_RNDN);
       MPFR_SET_EXP (x, MPFR_GET_EXP (x)-1);
       break;
-    default:
+    case 11:
       mpfr_urandomb (x, RANDS);
       if (RAND_BOOL ())
         mpfr_neg (x, x, MPFR_RNDN);
       break;
+    default:
+      MPFR_ASSERTN (0);
     }
 }
 
-/* same as mpfr_cmp, but returns 0 for both NaN's */
-static int
-mpfr_compare (mpfr_srcptr a, mpfr_srcptr b)
-{
-  return (MPFR_IS_NAN(a)) ? !MPFR_IS_NAN(b) :
-    (MPFR_IS_NAN(b) || mpfr_cmp(a, b));
-}
-
 static void
 test3 (int (*testfunc)(mpfr_ptr, mpfr_srcptr, mpfr_srcptr, mpfr_rnd_t),
        const char *foo, mpfr_prec_t prec, mpfr_rnd_t rnd)
@@ -112,10 +106,10 @@
 
   /* for each variable, consider each of the following 6 possibilities:
      NaN, +Infinity, -Infinity, +0, -0 or a random number */
-  for (i=0; i < SPECIAL_MAX*SPECIAL_MAX ; i++)
+  for (i = 0; i < SPECIAL_MAX * SPECIAL_MAX; i++)
     {
-      set_special (ref2, i%SPECIAL_MAX);
-      set_special (ref3, i/SPECIAL_MAX);
+      set_special (ref2, i % SPECIAL_MAX);
+      set_special (ref3, i / SPECIAL_MAX);
 
       /* reference call: foo(a, b, c) */
       testfunc (ref1, ref2, ref3, rnd);
@@ -124,11 +118,11 @@
       mpfr_set (res1, ref2, rnd); /* exact operation */
       testfunc (res1, res1, ref3, rnd);
 
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, a, c) with %s for ", foo,
                   mpfr_print_rnd_mode (rnd));
-          DISP("a=",ref2); DISP2(", c=",ref3);
+          DISP("a=", ref2); DISP2(", c=", ref3);
           printf ("expected "); mpfr_dump (ref1);
           printf ("got      "); mpfr_dump (res1);
           exit (1);
@@ -137,11 +131,12 @@
       /* foo(a, b, a) */
       mpfr_set (res1, ref3, rnd);
       testfunc (res1, ref2, res1, rnd);
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, b, a) for ", foo);
-          DISP("b=",ref2); DISP2(", a=", ref3);
-          DISP("expected ", ref1); DISP2(", got ",res1);
+          DISP("b=", ref2); DISP2(", a=", ref3);
+          printf ("expected "); mpfr_dump (ref1);
+          printf ("got      "); mpfr_dump (res1);
           exit (1);
         }
 
@@ -151,11 +146,12 @@
       mpfr_set (res1, ref2, rnd);
       testfunc (res1, res1, res1, rnd);
 
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, a, a) for ", foo);
-          DISP2("a=",ref2);
-          DISP("expected ", ref1); DISP2(", got ", res1);
+          DISP2("a=", ref2);
+          printf ("expected "); mpfr_dump (ref1);
+          printf ("got      "); mpfr_dump (res1);
           exit (1);
         }
     }
@@ -187,13 +183,13 @@
   /* for each variable, consider each of the following 6 possibilities:
      NaN, +Infinity, -Infinity, +0, -0 or a random number */
 
-  for (i=0; i<SPECIAL_MAX; i++)
+  for (i = 0; i < SPECIAL_MAX; i++)
     {
       set_special (op1, i);
-      for (j=0; j<SPECIAL_MAX; j++)
+      for (j = 0; j < SPECIAL_MAX; j++)
         {
           set_special (op2, j);
-          for (k=0; k<SPECIAL_MAX; k++)
+          for (k = 0; k < SPECIAL_MAX; k++)
             {
               set_special (op3, k);
 
@@ -204,11 +200,12 @@
               mpfr_set (res, op1, rnd); /* exact operation */
               testfunc (res, res, op2, op3, rnd);
 
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, b, c) for ", foo);
                   DISP("a=", op1); DISP(", b=", op2); DISP2(", c=", op3);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
 
@@ -216,11 +213,12 @@
               mpfr_set (res, op2, rnd);
               testfunc (res, op1, res, op3, rnd);
 
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, b, c) for ", foo);
                   DISP("a=", op1); DISP(", b=", op2); DISP2(", c=", op3);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
 
@@ -228,35 +226,38 @@
               mpfr_set (res, op3, rnd);
               testfunc (res, op1, op2, res, rnd);
 
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, b, c) for ", foo);
                   DISP("a=", op1); DISP(", b=", op2); DISP2(", c=", op3);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
 
-              /* foo(a, a, a,c) */
+              /* foo(a, a, a, c) */
               testfunc (ref, op1, op1, op3, rnd);
               mpfr_set (res, op1, rnd);
               testfunc (res, res, res, op3, rnd);
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, b, c) for ", foo);
                   DISP("a=", op1); DISP(", a=", op2); DISP2(", c=", op3);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
 
-              /* foo(a, a, b,a) */
+              /* foo(a, a, b, a) */
               testfunc (ref, op1, op2, op1, rnd);
               mpfr_set (res, op1, rnd);
               testfunc (res, res, op2, res, rnd);
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, b, c) for ", foo);
                   DISP("a=", op1); DISP(", a=", op2); DISP2(", c=", op3);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
 
@@ -264,11 +265,12 @@
               testfunc (ref, op1, op2, op2, rnd);
               mpfr_set (res, op2, rnd);
               testfunc (res, op1, res, res, rnd);
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, b, c) for ", foo);
                   DISP("a=", op1); DISP(", a=", op2); DISP2(", c=", op3);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
 
@@ -276,11 +278,12 @@
               testfunc (ref, op1, op1, op1, rnd);
               mpfr_set (res, op1, rnd);
               testfunc (res, res, res, res, rnd);
-              if (mpfr_compare (res, ref))
+              if (! SAME_VAL (res, ref))
                 {
                   printf ("Error for %s(a, a, a, a) for ", foo);
                   DISP2("a=", op1);
-                  DISP("expected ", ref); DISP2(", got ", res);
+                  printf ("expected "); mpfr_dump (ref);
+                  printf ("got      "); mpfr_dump (res);
                   exit (1);
                 }
             }
@@ -313,10 +316,10 @@
 
   /* ref2 can be NaN, +Inf, -Inf, +0, -0 or any number
      ref3 can be 0 or any number */
-  for (i=0; i<SPECIAL_MAX*2; i++)
+  for (i = 0; i < SPECIAL_MAX * 2; i++)
     {
-      set_special (ref2, i%SPECIAL_MAX);
-      ref3 = i/SPECIAL_MAX == 0 ? 0 : randlimb ();
+      set_special (ref2, i % SPECIAL_MAX);
+      ref3 = i / SPECIAL_MAX == 0 ? 0 : randlimb ();
 
       /* reference call: foo(a, b, c) */
       testfunc (ref1, ref2, ref3, rnd);
@@ -325,10 +328,10 @@
       mpfr_set (res1, ref2, rnd); /* exact operation */
       testfunc (res1, res1, ref3, rnd);
 
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, a, c) for c=%u\n", foo, ref3);
-          DISP2("a=",ref2);
+          DISP2("a=", ref2);
           printf ("expected "); mpfr_dump (ref1);
           printf ("got      "); mpfr_dump (res1);
           exit (1);
@@ -356,10 +359,10 @@
   mpfr_init2 (ref3, prec);
   mpfr_init2 (res1, prec);
 
-  for (i=0; i<SPECIAL_MAX*2; i++)
+  for (i = 0; i < SPECIAL_MAX * 2; i++)
     {
-      set_special (ref3, i%SPECIAL_MAX);
-      ref2 = i/SPECIAL_MAX==0 ? 0 : randlimb ();
+      set_special (ref3, i % SPECIAL_MAX);
+      ref2 = i / SPECIAL_MAX == 0 ? 0 : randlimb ();
 
       /* reference call: foo(a, b, c) */
       testfunc (ref1, ref2, ref3, rnd);
@@ -367,7 +370,7 @@
       /* foo(a, b, a) */
       mpfr_set (res1, ref3, rnd); /* exact operation */
       testfunc (res1, ref2, res1, rnd);
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, b, a) for b=%u \n", foo, ref2);
           DISP2("a=", ref3);
@@ -397,7 +400,7 @@
   mpfr_init2 (ref2, prec);
   mpfr_init2 (res1, prec);
 
-  for (i=0; i<SPECIAL_MAX; i++)
+  for (i = 0; i < SPECIAL_MAX; i++)
     {
       set_special (ref2, i);
 
@@ -407,7 +410,7 @@
       /* foo(a, a) */
       mpfr_set (res1, ref2, rnd); /* exact operation */
       testfunc (res1, res1, rnd);
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, a) for ", foo);
           DISP2("a=", ref2);
@@ -437,7 +440,7 @@
   mpfr_init2 (ref2, prec);
   mpfr_init2 (res1, prec);
 
-  for (i=0; i<SPECIAL_MAX; i++)
+  for (i = 0; i < SPECIAL_MAX; i++)
     {
       set_special (ref2, i);
 
@@ -447,10 +450,10 @@
       /* foo(a, a) */
       mpfr_set (res1, ref2, MPFR_RNDN); /* exact operation */
       testfunc (res1, res1);
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for %s(a, a) for ", foo);
-          DISP2("a=",ref2);
+          DISP2("a=", ref2);
           DISP("expected", ref1); DISP2(", got ", res1);
           exit (1);
         }
@@ -479,7 +482,7 @@
   mpfr_init2 (res1, prec);
   mpfr_init2 (res2, prec);
 
-  for (i=0; i<SPECIAL_MAX; i++)
+  for (i = 0; i < SPECIAL_MAX; i++)
     {
       set_special (ref3, i);
 
@@ -489,12 +492,12 @@
       /* foo(a, b, a) */
       mpfr_set (res1, ref3, rnd); /* exact operation */
       testfunc (res1, res2, res1, rnd);
-      if (mpfr_compare (res1, ref1) || mpfr_compare (res2, ref2))
+      if (! SAME_VAL (res1, ref1) || ! SAME_VAL (res2, ref2))
         {
           printf ("Error for %s(a, b, a) for rnd=%s, ", foo,
                   mpfr_print_rnd_mode (rnd));
-          DISP2("a=",ref3);
-          DISP("expected (", ref1); DISP(",",ref2);
+          DISP2("a=", ref3);
+          DISP("expected (", ref1); DISP(",", ref2);
           DISP("), got (", res1); DISP(",", res2); printf(")\n");
           exit (1);
         }
@@ -502,11 +505,11 @@
       /* foo(a, b, b) */
       mpfr_set (res2, ref3, rnd); /* exact operation */
       testfunc (res1, res2, res2, rnd);
-      if (mpfr_compare (res1, ref1) || mpfr_compare (res2, ref2))
+      if (! SAME_VAL (res1, ref1) || ! SAME_VAL (res2, ref2))
         {
           printf ("Error for %s(a, b, b) for ", foo);
-          DISP2("b=",ref3);
-          DISP("expected (", ref1); DISP(",",ref2);
+          DISP2("b=", ref3);
+          DISP("expected (", ref1); DISP(",", ref2);
           DISP("), got (", res1); DISP(",", res2); printf(")\n");
           exit (1);
         }
@@ -561,10 +564,10 @@
       mpfr_set (res1, ref2, rnd); /* exact operation */
       mpfr_pow (res1, res1, ref3, rnd);
 
-      if (mpfr_compare (res1, ref1))
+      if (! SAME_VAL (res1, ref1))
         {
           printf ("Error for pow_int(a, a, c) for ");
-          DISP("a=",ref2); DISP2(", c=",ref3);
+          DISP("a=", ref2); DISP2(", c=", ref3);
           printf ("expected "); mpfr_dump (ref1);
           printf ("got      "); mpfr_dump (res1);
           exit (1);
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-05-12 15:08:39.233546717 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-05-12 15:08:39.325546612 +0000
@@ -0,0 +1 @@
+pow_general
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-05-12 15:06:11.885721962 +0000
+++ mpfr-4.2.0-b/VERSION	2023-05-12 15:08:39.325546612 +0000
@@ -1 +1 @@
-4.2.0-p6
+4.2.0-p7
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-05-12 15:06:11.877721972 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-05-12 15:08:39.321546616 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p6"
+#define MPFR_VERSION_STRING "4.2.0-p7"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/pow.c mpfr-4.2.0-b/src/pow.c
--- mpfr-4.2.0-a/src/pow.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/src/pow.c	2023-05-12 15:08:39.309546630 +0000
@@ -131,7 +131,6 @@
   /* Declaration of the size variable */
   mpfr_prec_t Nz = MPFR_PREC(z);               /* target precision */
   mpfr_prec_t Nt;                              /* working precision */
-  mpfr_exp_t err;                              /* error */
   MPFR_ZIV_DECL (ziv_loop);
 
   MPFR_LOG_FUNC
@@ -171,12 +170,14 @@
   MPFR_ZIV_INIT (ziv_loop, Nt);
   for (;;)
     {
+      mpfr_exp_t err, exp_t;
       MPFR_BLOCK_DECL (flags1);
 
       /* compute exp(y*ln|x|), using MPFR_RNDU to get an upper bound, so
          that we can detect underflows. */
       mpfr_log (t, absx, MPFR_IS_NEG (y) ? MPFR_RNDD : MPFR_RNDU); /* ln|x| */
       mpfr_mul (t, y, t, MPFR_RNDU);                              /* y*ln|x| */
+      exp_t = MPFR_GET_EXP (t);
       if (k_non_zero)
         {
           MPFR_LOG_MSG (("subtract k * ln(2)\n", 0));
@@ -188,14 +189,16 @@
           MPFR_LOG_VAR (t);
         }
       /* estimate of the error -- see pow function in algorithms.tex.
-         The error on t is at most 1/2 + 3*2^(EXP(t)+1) ulps, which is
-         <= 2^(EXP(t)+3) for EXP(t) >= -1, and <= 2 ulps for EXP(t) <= -2.
+         The error on t before the subtraction of k*log(2) is at most
+         1/2 + 3*2^(EXP(t)+1) ulps, which is <= 2^(EXP(t)+3) for EXP(t) >= -1,
+         and <= 2 ulps for EXP(t) <= -2.
          Additional error if k_no_zero: treal = t * errk, with
          1 - |k| * 2^(-Nt) <= exp(-|k| * 2^(-Nt)) <= errk <= 1,
          i.e., additional absolute error <= 2^(EXP(k)+EXP(t)-Nt).
-         Total error <= 2^err1 + 2^err2 <= 2^(max(err1,err2)+1). */
-      err = MPFR_NOTZERO (t) && MPFR_GET_EXP (t) >= -1 ?
-        MPFR_GET_EXP (t) + 3 : 1;
+         Total ulp error <= 2^err1 + 2^err2 <= 2^(max(err1,err2)+1),
+         where err1 = EXP(t)+3 for EXP(t) >= -1, and 1 otherwise,
+         and err2 = EXP(k). */
+      err = MPFR_NOTZERO (t) && exp_t >= -1 ? exp_t + 3 : 1;
       if (k_non_zero)
         {
           if (MPFR_GET_EXP (k) > err)
@@ -328,11 +331,17 @@
        */
       if (rnd_mode == MPFR_RNDN && inexact < 0 && lk < 0 &&
           MPFR_GET_EXP (z) == __gmpfr_emin - 1 - lk && mpfr_powerof2_raw (z))
-        /* Rounding to nearest, real result > z * 2^k = 2^(emin - 2),
-         * underflow case: we will obtain the correct result and exceptions
-         *  by replacing z by nextabove(z).
-         */
-        mpfr_nextabove (z);
+        /* Rounding to nearest, exact result > z * 2^k = 2^(emin - 2),
+         * and underflow case because the rounded result assuming an
+         * unbounded exponent range is 2^(emin - 2). We need to round
+         * to 2^(emin - 1), i.e. to round toward +inf.
+         * Note: the old code was using "mpfr_nextabove (z);" instead of
+         * setting rnd_mode to MPFR_RNDU for the call to mpfr_mul_2si, but
+         * this was incorrect in precision 1 because in this precision,
+         * mpfr_nextabove gave 2^(emin - 1), which is representable,
+         * so that mpfr_mul_2si did not generate the wanted underflow
+         * (the value was correct, but the underflow flag was missing). */
+        rnd_mode = MPFR_RNDU;
       MPFR_CLEAR_FLAGS ();
       inex2 = mpfr_mul_2si (z, z, lk, rnd_mode);
       if (inex2)  /* underflow or overflow */
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-05-12 15:06:11.885721962 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-05-12 15:08:39.325546612 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p6";
+  return "4.2.0-p7";
 }
diff -Naurd mpfr-4.2.0-a/tests/texp10.c mpfr-4.2.0-b/tests/texp10.c
--- mpfr-4.2.0-a/tests/texp10.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/texp10.c	2023-05-12 15:08:39.309546630 +0000
@@ -190,6 +190,187 @@
   mpfr_clear (y);
 }
 
+/* Bug in mpfr_pow_general found by ofuf_thresholds (on 2023-02-13 for
+   a 32-bit exponent, changed on 2023-03-06 for a 64-bit exponent too),
+   fixed in commit b62966df913f73f08b3c5252e1d0c702bc20442f.
+   With a 32-bit exponent, failure for i=0.
+     expected 0.1111E1073741823
+     got      @Inf@
+     expected flags = inexact (8)
+     got flags      = overflow inexact (10)
+   With a 64-bit exponent, failure for i=1.
+     expected 0.11111111111111111111111E4611686018427387903
+     got      @Inf@
+     expected flags = inexact (8)
+     got flags      = overflow inexact (10)
+   Note: ofuf_thresholds was added to the master branch, but for the
+   time being, there are issues with these tests.
+*/
+static void
+bug20230213 (void)
+{
+  const char *s[2] = {
+    "0x1.34413504b3ccdbd5dd8p+28",
+    "0x1.34413509f79fef2c4e0dd14a7ae0ecfbacdbp+60"
+  };
+  mpfr_t x1, x2, y1, y2;
+  mpfr_prec_t px[2] = { 74, 147 };
+  mpfr_prec_t py[2] = { 4, 23 };
+  mpfr_exp_t old_emax, emax;
+  mpfr_flags_t flags1, flags2;
+  int i;
+
+  old_emax = mpfr_get_emax ();
+
+  for (i = 0; i < 2; i++)
+    {
+      if (i != 0)
+        set_emax (MPFR_EMAX_MAX);
+
+      emax = mpfr_get_emax ();
+
+      mpfr_inits2 (px[i], x1, x2, (mpfr_ptr) 0);
+      mpfr_inits2 (py[i], y1, y2, (mpfr_ptr) 0);
+
+      mpfr_setmax (y1, emax);
+      mpfr_log10 (x1, y1, MPFR_RNDD);
+      mpfr_set_str (x2, s[i], 0, MPFR_RNDN);
+      /* For i == 0, emax == 2^30, so that the value can be checked.
+         For i != 0, check the value for the case emax == 2^62.
+         The "0UL" ensures that the shifts are valid. */
+      if (i == 0 || (((0UL + MPFR_EMAX_MAX) >> 31) >> 30) == 1)
+        {
+          /* printf ("Checking x1 for i=%d\n", i); */
+          MPFR_ASSERTN (mpfr_equal_p (x1, x2));
+        }
+
+      /* Let MAXF be the maximum finite value (y1 above).
+         Since x1 < log10(MAXF), one should have exp10(x1) < MAXF, and
+         therefore, y2 = RU(exp10(x1)) <= RU(MAXF) = MAXF (no overflow). */
+      flags1 = MPFR_FLAGS_INEXACT;
+      mpfr_clear_flags ();
+      mpfr_exp10 (y2, x1, MPFR_RNDU);
+      flags2 = __gmpfr_flags;
+
+      if (! (mpfr_lessequal_p (y2, y1) && flags2 == flags1))
+        {
+          printf ("Error in bug20230213 for i=%d\n", i);
+          printf ("emax = %" MPFR_EXP_FSPEC "d\n", (mpfr_eexp_t) emax);
+          printf ("expected "); mpfr_dump (y1);
+          printf ("got      "); mpfr_dump (y2);
+          printf ("expected flags =");
+          flags_out (flags1);
+          printf ("got flags      =");
+          flags_out (flags2);
+          exit (1);
+        }
+
+      mpfr_clears (x1, x2, y1, y2, (mpfr_ptr) 0);
+    }
+
+  set_emax (old_emax);
+}
+
+/* Bug in mpfr_pow_general in precision 1 in the particular case of
+   rounding to nearest, z * 2^k = 2^(emin - 2) and real result larger
+   than this value; fixed in ff5012b61d5e5fee5156c57b8aa8fc1739c2a771
+   (which is simplified in 4f5de980be290687ac1409aa02873e9e0dd1a030);
+   initially found by ofuf_thresholds (though the test was incorrect).
+   With a 32-bit exponent, failure for i=0.
+   With a 64-bit exponent, failure for i=1.
+   The result was correct, but the underflow flag was missing.
+   Note: ofuf_thresholds was added to the master branch, but for the
+   time being, there are issues with these tests.
+*/
+static void
+bug20230427 (void)
+{
+  const char *s[2] = {
+    "-0.1001101000100000100110101000011E29",
+    "-0.100110100010000010011010100001001111101111001111111101111001101E61"
+  };
+  mpfr_t x, y, z, t1, t2;
+  mpfr_exp_t old_emin;
+  mpfr_flags_t flags, ex_flags;
+  int i, inex;
+
+  old_emin = mpfr_get_emin ();
+
+  mpfr_init2 (x, 63);
+  mpfr_inits2 (1, y, z, (mpfr_ptr) 0);
+  mpfr_inits2 (128, t1, t2, (mpfr_ptr) 0);
+
+  for (i = 0; i < 2; i++)
+    {
+      if (i == 0)
+        {
+          /* Basic check: the default emin should be -2^30 (exactly). */
+          if (mpfr_get_emin () != -1073741823)
+            abort ();
+        }
+      else
+        {
+          /* This test assumes that MPFR_EMIN_MIN = -2^62 (exactly).
+             The "0UL" ensures that the shifts are valid. */
+          if ((((0UL - MPFR_EMIN_MIN) >> 31) >> 30) != 1)
+            break;
+
+          set_emin (MPFR_EMIN_MIN);
+        }
+
+      mpfr_set_str_binary (x, s[i]);
+
+      /* We will test 10^x rounded to nearest in precision 1.
+         Check that 2^(emin - 2) < 10^x < (3/2) * 2^(emin - 2).
+         This is approximate, but by outputting the values, one can check
+         that one is not too close to the boundaries:
+           emin - 2              = -4611686018427387905
+           log2(10^x)           ~= -4611686018427387904.598
+           emin - 2 + log2(3/2) ~= -4611686018427387904.415
+         Thus the result should be the smallest positive number 2^(emin - 1)
+         because 10^x is closer to this number than to 0, the midpoint being
+         2^(emin - 2). And there should be an underflow in precision 1 because
+         the result rounded to nearest in an unbounded exponent range should
+         have been 2^(emin - 2), the midpoint being (3/2) * 2^(emin - 2).
+      */
+      mpfr_set_ui (t1, 10, MPFR_RNDN);
+      mpfr_log2 (t2, t1, MPFR_RNDN);
+      mpfr_mul (t1, t2, x, MPFR_RNDN);
+      inex = mpfr_set_exp_t (t2, mpfr_get_emin () - 2, MPFR_RNDN);
+      MPFR_ASSERTN (inex == 0);
+      MPFR_ASSERTN (mpfr_greater_p (t1, t2));  /* log2(10^x) > emin - 2 */
+      inex = mpfr_sub (t1, t1, t2, MPFR_RNDN);
+      MPFR_ASSERTN (inex == 0);
+      mpfr_set_ui (t2, 3, MPFR_RNDN);
+      mpfr_log2 (t2, t2, MPFR_RNDN);
+      mpfr_sub_ui (t2, t2, 1, MPFR_RNDN);  /* log2(3/2) */
+      MPFR_ASSERTN (mpfr_less_p (t1, t2));
+
+      mpfr_clear_flags ();
+      mpfr_exp10 (y, x, MPFR_RNDN);
+      flags = __gmpfr_flags;
+      ex_flags = MPFR_FLAGS_UNDERFLOW | MPFR_FLAGS_INEXACT;
+
+      mpfr_setmin (z, mpfr_get_emin ());  /* z = 0.1@emin */
+      if (! (mpfr_equal_p (y, z) && flags == ex_flags))
+        {
+          printf ("Error in bug20230427 for i=%d\n", i);
+          printf ("expected "); mpfr_dump (z);
+          printf ("got      "); mpfr_dump (y);
+          printf ("emin =       %" MPFR_EXP_FSPEC "d\n",
+                  (mpfr_eexp_t) mpfr_get_emin ());
+          printf ("expected flags =");
+          flags_out (ex_flags);
+          printf ("got flags      =");
+          flags_out (flags);
+          exit (1);
+        }
+    }
+
+  mpfr_clears (x, y, z, t1, t2, (mpfr_ptr) 0);
+  set_emin (old_emin);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -199,6 +380,9 @@
 
   tests_start_mpfr ();
 
+  bug20230213 ();
+  bug20230427 ();
+
   special_overflow ();
   emax_m_eps ();
   exp_range ();
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-05-17 17:17:28.512360351 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-05-17 17:17:28.600360192 +0000
@@ -0,0 +1 @@
+compound
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-05-12 15:08:39.325546612 +0000
+++ mpfr-4.2.0-b/VERSION	2023-05-17 17:17:28.600360192 +0000
@@ -1 +1 @@
-4.2.0-p7
+4.2.0-p8
diff -Naurd mpfr-4.2.0-a/src/compound.c mpfr-4.2.0-b/src/compound.c
--- mpfr-4.2.0-a/src/compound.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/src/compound.c	2023-05-17 17:17:28.588360213 +0000
@@ -55,9 +55,9 @@
 mpfr_compound_si (mpfr_ptr y, mpfr_srcptr x, long n, mpfr_rnd_t rnd_mode)
 {
   int inexact, compared, k, nloop;
-  mpfr_t t;
-  mpfr_exp_t e;
-  mpfr_prec_t prec;
+  mpfr_t t, u;
+  mpfr_prec_t py, prec, extra;
+  mpfr_rnd_t rnd1;
   MPFR_ZIV_DECL (loop);
   MPFR_SAVE_EXPO_DECL (expo);
 
@@ -136,64 +136,185 @@
 
   MPFR_SAVE_EXPO_MARK (expo);
 
-  prec = MPFR_PREC(y);
-  prec += MPFR_INT_CEIL_LOG2 (prec) + 6;
+  py = MPFR_GET_PREC (y);
+  prec = py + MPFR_INT_CEIL_LOG2 (py) + 6;
 
   mpfr_init2 (t, prec);
+  mpfr_init2 (u, prec);
 
   k = MPFR_INT_CEIL_LOG2(SAFE_ABS (unsigned long, n));  /* thus |n| <= 2^k */
 
+  /* We compute u=log2p1(x) with prec+extra bits, since we lose some bits
+     in 2^u. */
+  extra = 0;
+  rnd1 = VSIGN (n) == MPFR_SIGN (x) ? MPFR_RNDD : MPFR_RNDU;
+
   MPFR_ZIV_INIT (loop, prec);
   for (nloop = 0; ; nloop++)
     {
-      /* we compute (1+x)^n as 2^(n*log2p1(x)) */
-      inexact = mpfr_log2p1 (t, x, MPFR_RNDN) != 0;
-      e = MPFR_GET_EXP(t);
-      /* |t - log2(1+x)| <= 1/2*ulp(t) = 2^(e-prec-1) */
-      inexact |= mpfr_mul_si (t, t, n, MPFR_RNDN) != 0;
-      /* |t - n*log2(1+x)| <= 2^(e2-prec-1) + |n|*2^(e-prec-1)
-                           <= 2^(e2-prec-1) + 2^(e+k-prec-1) <= 2^(e+k-prec)
-                          where |n| <= 2^k, and e2 is the new exponent of t. */
-      MPFR_ASSERTD(MPFR_GET_EXP(t) <= e + k);
-      e += k;
-      /* |t - n*log2(1+x)| <= 2^(e-prec) */
-      /* detect overflow */
-      if (nloop == 0 && mpfr_cmp_si (t, __gmpfr_emax) >= 0)
+      unsigned int inex;
+      mpfr_exp_t e, e2, ex;
+      mpfr_prec_t precu = MPFR_ADD_PREC (prec, extra);
+      mpfr_prec_t new_extra;
+      mpfr_rnd_t rnd2;
+
+      /* We compute (1+x)^n as 2^(n*log2p1(x)),
+         and we round toward 1, thus we round n*log2p1(x) toward 0,
+         thus for x*n > 0 we round log2p1(x) toward -Inf, and for x*n < 0
+         we round log2p1(x) toward +Inf. */
+      inex = mpfr_log2p1 (u, x, rnd1) != 0;
+      e = MPFR_GET_EXP (u);
+      /* |u - log2(1+x)| <= ulp(t) = 2^(e-precu) */
+      inex |= mpfr_mul_si (u, u, n, MPFR_RNDZ) != 0;
+      e2 = MPFR_GET_EXP (u);
+      /* |u - n*log2(1+x)| <= 2^(e2-precu) + |n|*2^(e-precu)
+                           <= 2^(e2-precu) + 2^(e+k-precu) <= 2^(e+k+1-precu)
+                          where |n| <= 2^k, and e2 is the new exponent of u. */
+      MPFR_ASSERTD (e2 <= e + k);
+      e += k + 1;
+      MPFR_ASSERTN (e2 <= MPFR_PREC_MAX);
+      new_extra = e2 > 0 ? e2 : 0;
+      /* |u - n*log2(1+x)| <= 2^(e-precu) */
+      /* detect overflow: since we rounded n*log2p1(x) toward 0,
+         if n*log2p1(x) >= __gmpfr_emax, we are sure there is overflow. */
+      if (mpfr_cmp_si (u, __gmpfr_emax) >= 0)
         {
           MPFR_ZIV_FREE (loop);
           mpfr_clear (t);
+          mpfr_clear (u);
           MPFR_SAVE_EXPO_FREE (expo);
           return mpfr_overflow (y, rnd_mode, 1);
         }
-      /* detect underflow */
-      if (nloop == 0 && mpfr_cmp_si (t, __gmpfr_emin - 1) <= 0)
+      /* detect underflow: similarly, since we rounded n*log2p1(x) toward 0,
+         if n*log2p1(x) < __gmpfr_emin-1, we are sure there is underflow. */
+      if (mpfr_cmp_si (u, __gmpfr_emin - 1) < 0)
         {
           MPFR_ZIV_FREE (loop);
           mpfr_clear (t);
+          mpfr_clear (u);
           MPFR_SAVE_EXPO_FREE (expo);
           return mpfr_underflow (y,
-                            (rnd_mode == MPFR_RNDN) ? MPFR_RNDZ : rnd_mode, 1);
+                            rnd_mode == MPFR_RNDN ? MPFR_RNDZ : rnd_mode, 1);
         }
       /* Detect cases where result is 1 or 1+ulp(1) or 1-1/2*ulp(1):
-         |2^t - 1| = |exp(t*log(2)) - 1| <= |t|*log(2) < |t| */
-      if (nloop == 0 && MPFR_GET_EXP(t) < - (mpfr_exp_t) MPFR_PREC(y))
+         |2^u - 1| = |exp(u*log(2)) - 1| <= |u|*log(2) < |u| */
+      if (nloop == 0 && MPFR_GET_EXP(u) < - py)
         {
-          /* since ulp(1) = 2^(1-PREC(y)), we have |t| < 1/4*ulp(1) */
+          /* since ulp(1) = 2^(1-py), we have |u| < 1/4*ulp(1) */
           /* mpfr_compound_near_one must be called in the extended
              exponent range, so that 1 is representable. */
-          inexact = mpfr_compound_near_one (y, MPFR_SIGN (t), rnd_mode);
+          inexact = mpfr_compound_near_one (y, MPFR_SIGN (u), rnd_mode);
           goto end;
         }
-      inexact |= mpfr_exp2 (t, t, MPFR_RNDA) != 0;
-      /* |t - (1+x)^n| <= ulp(t) + |t|*log(2)*2^(e-prec)
-                       < 2^(EXP(t)-prec) + 2^(EXP(t)+e-prec) */
-      e = (e >= 0) ? e + 1 : 1;
+      /* FIXME: mpfr_exp2 could underflow to the smallest positive number
+         since MPFR_RNDA is used, and this case will not be detected by
+         MPFR_CAN_ROUND (see BUGS). Either fix that, or do early underflow
+         detection (which may be necessary). */
+      /* round 2^u toward 1 */
+      rnd2 = MPFR_IS_POS (u) ? MPFR_RNDD : MPFR_RNDU;
+      inex |= mpfr_exp2 (t, u, rnd2) != 0;
+      /* we had |u - n*log2(1+x)| < 2^(e-precu)
+         thus u = n*log2(1+x) + delta with |delta| < 2^(e-precu)
+         then 2^u = (1+x)^n * 2^delta with |delta| < 2^(e-precu).
+         For |delta| < 0.5, |2^delta - 1| <= |delta| thus
+         |t - (1+x)^n| <= ulp(t) + |t|*2^(e-precu)
+                       < 2^(EXP(t)-prec) + 2^(EXP(t)+e-precu) */
+      e = (precu - prec >= e) ? 1 : e + 1 - (precu - prec);
       /* now |t - (1+x)^n| < 2^(EXP(t)+e-prec) */
 
-      if (MPFR_LIKELY (inexact == 0 ||
-                       MPFR_CAN_ROUND (t, prec - e, MPFR_PREC(y), rnd_mode)))
+      if (MPFR_LIKELY (!inex || MPFR_CAN_ROUND (t, prec - e, py, rnd_mode)))
         break;
 
+      /* If t fits in the target precision (or with 1 more bit), then we can
+         round, assuming the working precision is large enough, but the above
+         MPFR_CAN_ROUND() will fail because we cannot determine the ternary
+         value. However since we rounded t toward 1, we can determine it.
+         Since the error in the approximation t is at most 2^e ulp(t),
+         this error should be less than 1/2 ulp(y), thus we should have
+         prec - py >= e + 1. */
+      if (mpfr_min_prec (t) <= py + 1 && prec - py >= e + 1)
+        {
+          /* we add/subtract one ulp to get the correct rounding */
+          if (rnd2 == MPFR_RNDD) /* t was rounded downwards */
+            mpfr_nextabove (t);
+          else
+            mpfr_nextbelow (t);
+          break;
+        }
+
+      /* Detect particular cases where Ziv's strategy may take too much
+         memory and be too long, i.e. when x^n fits in the target precision
+         (+ 1 additional bit for rounding to nearest) and the exact result
+         (1+x)^n is very close to x^n.
+         Necessarily, x is a large even integer and n > 0 (thus n > 1).
+         Since this does not depend on the working precision, we only
+         check this at the first iteration (nloop == 0).
+         Hence the first "if" below and the kx < ex test of the second "if"
+         (x is an even integer iff its least bit 1 has exponent >= 1).
+         The second test of the second "if" corresponds to another simple
+         condition that implies that x^n fits in the target precision.
+         Here are the details:
+         Let k be the minimum length of the significand of x, and x' the odd
+         (integer) significand of x. This means  that 2^(k-1) <= x' < 2^k.
+         Thus 2^(n*(k-1)) <= (x')^n < 2^(k*n), and x^n has between n*(k-1)+1
+         and k*n bits. So x^n can fit into p bits only if p >= n*(k-1)+1,
+         i.e. n*(k-1) <= p-1.
+         Note that x >= 2^k, so that x^n >= 2^(k*n). Since raw overflow
+         has already been detected, k*n cannot overflow if computed with
+         the mpfr_exp_t type. Hence the second test of the second "if",
+         which cannot overflow. */
+      MPFR_ASSERTD (n < 0 || n > 1);
+      if (nloop == 0 && n > 1 && (ex = MPFR_GET_EXP (x)) >= 17)
+        {
+          mpfr_prec_t kx = mpfr_min_prec (x);
+          mpfr_prec_t p = py + (rnd_mode == MPFR_RNDN);
+
+          MPFR_LOG_MSG (("Check if x^n fits... n=%ld kx=%Pd p=%Pd\n",
+                         n, kx, p));
+          if (kx < ex && n * (mpfr_exp_t) (kx - 1) <= p - 1)
+            {
+              mpfr_t v;
+
+              /* Check whether x^n really fits into p bits. */
+              mpfr_init2 (v, p);
+              inexact = mpfr_pow_ui (v, x, n, MPFR_RNDZ);
+              if (inexact == 0)
+                {
+                  MPFR_LOG_MSG (("x^n fits into p bits\n", 0));
+                  /* (x+1)^n = x^n * (1 + 1/x)^n
+                     For directed rounding, we can round when (1 + 1/x)^n
+                     < 1 + 2^-p, and then the result is x^n,
+                     except for rounding up. Indeed, if (1 + 1/x)^n < 1 + 2^-p,
+                     1 <= (x+1)^n < x^n * (1 + 2^-p) = x^n + x^n/2^p
+                     < x^n + ulp(x^n).
+                     For rounding to nearest, we can round when (1 + 1/x)^n
+                     < 1 + 2^-p, and then the result is x^n when x^n fits
+                     into p-1 bits, and nextabove(x^n) otherwise. */
+                  mpfr_ui_div (t, 1, x, MPFR_RNDU);
+                  mpfr_add_ui (t, t, 1, MPFR_RNDU);
+                  mpfr_pow_ui (t, t, n, MPFR_RNDU);
+                  mpfr_sub_ui (t, t, 1, MPFR_RNDU);
+                  /* t cannot be zero */
+                  if (MPFR_GET_EXP(t) < - py)
+                    {
+                      mpfr_set (y, v, MPFR_RNDZ);
+                      if ((rnd_mode == MPFR_RNDN && mpfr_min_prec (v) == p)
+                          || rnd_mode == MPFR_RNDU || rnd_mode == MPFR_RNDA)
+                        {
+                          /* round up */
+                          mpfr_nextabove (y);
+                          inexact = 1;
+                        }
+                      else
+                        inexact = -1;
+                      mpfr_clear (v);
+                      goto end;
+                    }
+                }
+              mpfr_clear (v);
+            }
+        }
+
       /* Exact cases like compound(0.5,2) = 9/4 must be detected, since
          except for 1+x power of 2, the log2p1 above will be inexact,
          so that in the Ziv test, inexact != 0 and MPFR_CAN_ROUND will
@@ -211,6 +332,8 @@
 
       MPFR_ZIV_NEXT (loop, prec);
       mpfr_set_prec (t, prec);
+      extra = new_extra;
+      mpfr_set_prec (u, MPFR_ADD_PREC (prec, extra));
     }
 
   inexact = mpfr_set (y, t, rnd_mode);
@@ -218,6 +341,7 @@
  end:
   MPFR_ZIV_FREE (loop);
   mpfr_clear (t);
+  mpfr_clear (u);
 
   MPFR_SAVE_EXPO_FREE (expo);
   return mpfr_check_range (y, inexact, rnd_mode);
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-05-12 15:08:39.321546616 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-05-17 17:17:28.596360199 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p7"
+#define MPFR_VERSION_STRING "4.2.0-p8"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-05-12 15:08:39.325546612 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-05-17 17:17:28.600360192 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p7";
+  return "4.2.0-p8";
 }
diff -Naurd mpfr-4.2.0-a/tests/tcompound.c mpfr-4.2.0-b/tests/tcompound.c
--- mpfr-4.2.0-a/tests/tcompound.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tcompound.c	2023-05-17 17:17:28.588360213 +0000
@@ -238,18 +238,263 @@
   mpfr_clear (y);
 }
 
-static int
-mpfr_compound2 (mpfr_ptr y, mpfr_srcptr x, mpfr_rnd_t rnd_mode)
+/* Failure with mpfr_compound_si from 2021-02-15 due to
+   incorrect underflow detection. */
+static void
+bug_20230206 (void)
 {
-  return mpfr_compound_si (y, x, 2, rnd_mode);
+  if (MPFR_PREC_MIN == 1)
+    {
+      mpfr_t x, y1, y2;
+      int inex1, inex2;
+      mpfr_flags_t flags1, flags2;
+#if MPFR_PREC_BITS >= 64
+      mpfr_exp_t emin;
+#endif
+
+      mpfr_inits2 (1, x, y1, y2, (mpfr_ptr) 0);
+      mpfr_set_ui_2exp (x, 1, -1, MPFR_RNDN);  /* x = 1/2 */
+
+      /* This first test is useful mainly for a 32-bit mpfr_exp_t type
+         (no failure with a 64-bit mpfr_exp_t type since the underflow
+         threshold in the extended exponent range is much lower). */
+
+      mpfr_set_ui_2exp (y1, 1, -1072124363, MPFR_RNDN);
+      inex1 = -1;
+      flags1 = MPFR_FLAGS_INEXACT;
+      mpfr_clear_flags ();
+      /* -1832808704 ~= -2^30 / log2(3/2) */
+      inex2 = mpfr_compound_si (y2, x, -1832808704, MPFR_RNDN);
+      flags2 = __gmpfr_flags;
+      if (!(mpfr_equal_p (y1, y2) &&
+            SAME_SIGN (inex1, inex2) &&
+            flags1 == flags2))
+        {
+          printf ("Error in bug_20230206 (1):\n");
+          printf ("Expected ");
+          mpfr_dump (y1);
+          printf ("  with inex = %d, flags =", inex1);
+          flags_out (flags1);
+          printf ("Got      ");
+          mpfr_dump (y2);
+          printf ("  with inex = %d, flags =", inex2);
+          flags_out (flags2);
+          exit (1);
+        }
+
+      /* This second test is for a 64-bit mpfr_exp_t type
+         (it is disabled with a 32-bit mpfr_exp_t type). */
+
+      /* The "#if" makes sure that 64-bit constants are supported, avoiding
+         a compilation failure. The "if" makes sure that the constant is
+         representable in a long (this would not be the case with 32-bit
+         unsigned long and 64-bit limb). It also ensures that mpfr_exp_t
+         has at least 64 bits. */
+#if MPFR_PREC_BITS >= 64
+      emin = mpfr_get_emin ();
+      set_emin (MPFR_EMIN_MIN);
+      mpfr_set_ui_2exp (y1, 1, -4611686018427366846, MPFR_RNDN);
+      inex1 = 1;
+      flags1 = MPFR_FLAGS_INEXACT;
+      mpfr_clear_flags ();
+      /* -7883729320669216768 ~= -2^62 / log2(3/2) */
+      inex2 = mpfr_compound_si (y2, x, -7883729320669216768, MPFR_RNDN);
+      flags2 = __gmpfr_flags;
+      if (!(mpfr_equal_p (y1, y2) &&
+            SAME_SIGN (inex1, inex2) &&
+            flags1 == flags2))
+        {
+          printf ("Error in bug_20230206 (2):\n");
+          printf ("Expected ");
+          mpfr_dump (y1);
+          printf ("  with inex = %d, flags =", inex1);
+          flags_out (flags1);
+          printf ("Got      ");
+          mpfr_dump (y2);
+          printf ("  with inex = %d, flags =", inex2);
+          flags_out (flags2);
+          exit (1);
+        }
+      set_emin (emin);
+#endif
+
+      mpfr_clears (x, y1, y2, (mpfr_ptr) 0);
+    }
 }
 
+/* Reported by Patrick Pelissier on 2023-02-11 for the master branch
+   (tgeneric_ui.c with GMP_CHECK_RANDOMIZE=1412991715).
+   On a 32-bit host, one gets Inf (overflow) instead of 0.1E1071805703.
+*/
+static void
+bug_20230211 (void)
+{
+  mpfr_t x, y1, y2;
+  int inex1, inex2;
+  mpfr_flags_t flags1, flags2;
+
+  mpfr_inits2 (1, x, y1, y2, (mpfr_ptr) 0);
+  mpfr_set_ui_2exp (x, 1, -1, MPFR_RNDN);  /* x = 1/2 */
+  mpfr_set_ui_2exp (y1, 1, 1071805702, MPFR_RNDN);
+  inex1 = 1;
+  flags1 = MPFR_FLAGS_INEXACT;
+  mpfr_clear_flags ();
+  inex2 = mpfr_compound_si (y2, x, 1832263949, MPFR_RNDN);
+  flags2 = __gmpfr_flags;
+  if (!(mpfr_equal_p (y1, y2) &&
+        SAME_SIGN (inex1, inex2) &&
+        flags1 == flags2))
+    {
+      printf ("Error in bug_20230211:\n");
+      printf ("Expected ");
+      mpfr_dump (y1);
+      printf ("  with inex = %d, flags =", inex1);
+      flags_out (flags1);
+      printf ("Got      ");
+      mpfr_dump (y2);
+      printf ("  with inex = %d, flags =", inex2);
+      flags_out (flags2);
+      exit (1);
+    }
+  mpfr_clears (x, y1, y2, (mpfr_ptr) 0);
+}
+
+/* Integer overflow with compound.c d04caeae04c6a83276916c4fbac1fe9b0cec3c8b
+   (2023-02-23) or 952fb0f5cc2df1fffde3eb54c462fdae5f123ea6 in the 4.2 branch
+   on "n * (kx - 1) + 1". Note: if the only effect is just a random value,
+   this probably doesn't affect the result (one might enter the "if" while
+   one shouldn't, but the real check is done inside the "if"). This test
+   fails if -fsanitize=undefined -fno-sanitize-recover is used or if the
+   processor emits a signal in case of integer overflow.
+   This test has been made obsolete by the "kx < ex" condition
+   in 2cb3123891dd46fe0258d4aec7f8655b8ec69aaf (master branch)
+   or f5cb40571bc3d1559f05b230cf4ffecaf0952852 (4.2 branch). */
+static void
+bug_20230517 (void)
+{
+  mpfr_exp_t old_emax;
+  mpfr_t x;
+
+  old_emax = mpfr_get_emax ();
+  set_emax (MPFR_EMAX_MAX);
+
+  mpfr_init2 (x, 123456);
+  mpfr_set_ui (x, 65536, MPFR_RNDN);
+  mpfr_nextabove (x);
+  mpfr_compound_si (x, x, LONG_MAX >> 16, MPFR_RNDN);
+  mpfr_clear (x);
+
+  set_emax (old_emax);
+}
+
+/* Inverse function on non-special cases...
+   One has x = (1+y)^n with y > -1 and x > 0. Thus y = x^(1/n) - 1.
+   The inverse function is useful
+     - to build and check hard-to-round cases (see bad_cases() in tests.c);
+     - to test the behavior close to the overflow and underflow thresholds.
+   The case x = 0 actually needs to be handled as it may occur with
+   bad_cases() due to rounding.
+*/
 static int
-mpfr_compound3 (mpfr_ptr y, mpfr_srcptr x, mpfr_rnd_t rnd_mode)
+inv_compound (mpfr_ptr y, mpfr_srcptr x, long n, mpfr_rnd_t rnd_mode)
 {
-  return mpfr_compound_si (y, x, 3, rnd_mode);
+  mpfr_t t;
+  int inexact;
+  mpfr_prec_t precy, prect;
+  MPFR_ZIV_DECL (loop);
+  MPFR_SAVE_EXPO_DECL (expo);
+
+  MPFR_ASSERTN (n != 0);
+
+  if (MPFR_UNLIKELY (MPFR_IS_ZERO (x)))
+    {
+      if (n > 0)
+        return mpfr_set_si (y, -1, rnd_mode);
+      else
+        {
+          MPFR_SET_INF (y);
+          MPFR_SET_POS (y);
+          MPFR_RET (0);
+        }
+    }
+
+  MPFR_SAVE_EXPO_MARK (expo);
+
+  if (mpfr_equal_p (x, __gmpfr_one))
+    {
+      MPFR_SAVE_EXPO_FREE (expo);
+      mpfr_set_zero (y, 1);
+      MPFR_RET (0);
+    }
+
+  precy = MPFR_GET_PREC (y);
+  prect = precy + 20;
+  mpfr_init2 (t, prect);
+
+  MPFR_ZIV_INIT (loop, prect);
+  for (;;)
+    {
+      mpfr_exp_t expt1, expt2, err;
+      unsigned int inext;
+
+      if (mpfr_rootn_si (t, x, n, MPFR_RNDN) == 0)
+        {
+          /* With a huge t, this case would yield inext != 0 and a
+             MPFR_CAN_ROUND failure until a huge precision is reached
+             (as the result is very close to an exact point). Fortunately,
+             since t is exact, we can obtain the correctly rounded result
+             by doing the second operation to the target precision directly.
+          */
+          inexact = mpfr_sub_ui (y, t, 1, rnd_mode);
+          goto end;
+        }
+      expt1 = MPFR_GET_EXP (t);
+      /* |error| <= 2^(expt1-prect-1) */
+      inext = mpfr_sub_ui (t, t, 1, MPFR_RNDN);
+      if (MPFR_UNLIKELY (MPFR_IS_ZERO (t)))
+        goto cont;  /* cannot round yet */
+      expt2 = MPFR_GET_EXP (t);
+      err = 1;
+      if (expt2 < expt1)
+        err += expt1 - expt2;
+      /* |error(rootn)| <= 2^(err+expt2-prect-2)
+         and if mpfr_sub_ui is inexact:
+         |error| <= 2^(err+expt2-prect-2) + 2^(expt2-prect-1)
+                 <= (2^(err-1) + 1) * 2^(expt2-prect-1)
+                 <= 2^((err+1)+expt2-prect-2) */
+      if (inext)
+        err++;
+      /* |error| <= 2^(err+expt2-prect-2) */
+      if (MPFR_CAN_ROUND (t, prect + 2 - err, precy, rnd_mode))
+        break;
+
+    cont:
+      MPFR_ZIV_NEXT (loop, prect);
+      mpfr_set_prec (t, prect);
+    }
+
+  inexact = mpfr_set (y, t, rnd_mode);
+
+ end:
+  MPFR_ZIV_FREE (loop);
+  mpfr_clear (t);
+  MPFR_SAVE_EXPO_FREE (expo);
+  return mpfr_check_range (y, inexact, rnd_mode);
 }
 
+#define DEFN(N)                                                         \
+  static int mpfr_compound##N (mpfr_ptr y, mpfr_srcptr x, mpfr_rnd_t r) \
+  { return mpfr_compound_si (y, x, N, r); }                             \
+  static int inv_compound##N (mpfr_ptr y, mpfr_srcptr x, mpfr_rnd_t r)  \
+  { return inv_compound (y, x, N, r); }
+
+DEFN(2)
+DEFN(3)
+DEFN(4)
+DEFN(5)
+DEFN(17)
+DEFN(120)
+
 #define TEST_FUNCTION mpfr_compound2
 #define test_generic test_generic_compound2
 #include "tgeneric.c"
@@ -258,17 +503,55 @@
 #define test_generic test_generic_compound3
 #include "tgeneric.c"
 
+#define TEST_FUNCTION mpfr_compound4
+#define test_generic test_generic_compound4
+#include "tgeneric.c"
+
+#define TEST_FUNCTION mpfr_compound5
+#define test_generic test_generic_compound5
+#include "tgeneric.c"
+
+#define TEST_FUNCTION mpfr_compound17
+#define test_generic test_generic_compound17
+#include "tgeneric.c"
+
+#define TEST_FUNCTION mpfr_compound120
+#define test_generic test_generic_compound120
+#include "tgeneric.c"
+
 int
 main (void)
 {
   tests_start_mpfr ();
 
   check_ieee754 ();
+  bug_20230206 ();
+  bug_20230211 ();
+  bug_20230517 ();
 
   test_generic_si (MPFR_PREC_MIN, 100, 100);
 
   test_generic_compound2 (MPFR_PREC_MIN, 100, 100);
   test_generic_compound3 (MPFR_PREC_MIN, 100, 100);
+  test_generic_compound4 (MPFR_PREC_MIN, 100, 100);
+  test_generic_compound5 (MPFR_PREC_MIN, 100, 100);
+  test_generic_compound17 (MPFR_PREC_MIN, 100, 100);
+  test_generic_compound120 (MPFR_PREC_MIN, 100, 100);
+
+  /* Note: For small n, we need a psup high enough to avoid too many
+     "f exact while f^(-1) inexact" occurrences in bad_cases(). */
+  bad_cases (mpfr_compound2, inv_compound2, "mpfr_compound2",
+             0, -256, 255, 4, 128, 240, 40);
+  bad_cases (mpfr_compound3, inv_compound3, "mpfr_compound3",
+             0, -256, 255, 4, 128, 120, 40);
+  bad_cases (mpfr_compound4, inv_compound4, "mpfr_compound4",
+             0, -256, 255, 4, 128, 80, 40);
+  bad_cases (mpfr_compound5, inv_compound5, "mpfr_compound5",
+             0, -256, 255, 4, 128, 80, 40);
+  bad_cases (mpfr_compound17, inv_compound17, "mpfr_compound17",
+             0, -256, 255, 4, 128, 80, 40);
+  bad_cases (mpfr_compound120, inv_compound120, "mpfr_compound120",
+             0, -256, 255, 4, 128, 80, 40);
 
   tests_end_mpfr ();
   return 0;
diff -Naurd mpfr-4.2.0-a/tests/tests.c mpfr-4.2.0-b/tests/tests.c
--- mpfr-4.2.0-a/tests/tests.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/tests/tests.c	2023-05-17 17:17:28.588360213 +0000
@@ -1086,10 +1086,9 @@
                 }
               if (inex_inv)
                 {
-                  printf ("bad_cases: f exact while f^(-1) inexact,\n"
-                          "due to a poor choice of the parameters.\n");
-                  exit (1);
-                  /* alternatively, goto next_i */
+                  if (dbg)
+                    printf ("bad_cases: f exact while f^(-1) inexact\n");
+                  goto does_not_match;
                 }
               inex = 0;
               break;
@@ -1112,6 +1111,10 @@
           if (mpfr_nanflag_p () || mpfr_overflow_p () || mpfr_underflow_p ()
               || ! mpfr_equal_p (z, y))
             {
+              /* This may occur when psup is not large enough: evaluating
+                 x = (f^(-1))(y) then z = f(x) may not give back y if the
+                 precision of x is too small. */
+            does_not_match:
               if (dbg)
                 {
                   printf ("bad_cases: inverse doesn't match for %s\ny = ",
diff -Naurd mpfr-4.2.0-a/PATCHES mpfr-4.2.0-b/PATCHES
--- mpfr-4.2.0-a/PATCHES	2023-05-17 17:19:35.484201703 +0000
+++ mpfr-4.2.0-b/PATCHES	2023-05-17 17:19:35.596201603 +0000
@@ -0,0 +1 @@
+printf_large_prec_for_g
diff -Naurd mpfr-4.2.0-a/VERSION mpfr-4.2.0-b/VERSION
--- mpfr-4.2.0-a/VERSION	2023-05-17 17:17:28.600360192 +0000
+++ mpfr-4.2.0-b/VERSION	2023-05-17 17:19:35.596201603 +0000
@@ -1 +1 @@
-4.2.0-p8
+4.2.0-p9
diff -Naurd mpfr-4.2.0-a/src/mpfr.h mpfr-4.2.0-b/src/mpfr.h
--- mpfr-4.2.0-a/src/mpfr.h	2023-05-17 17:17:28.596360199 +0000
+++ mpfr-4.2.0-b/src/mpfr.h	2023-05-17 17:19:35.592201606 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 4
 #define MPFR_VERSION_MINOR 2
 #define MPFR_VERSION_PATCHLEVEL 0
-#define MPFR_VERSION_STRING "4.2.0-p8"
+#define MPFR_VERSION_STRING "4.2.0-p9"
 
 /* User macros:
    MPFR_USE_FILE:        Define it to make MPFR define functions dealing
diff -Naurd mpfr-4.2.0-a/src/vasprintf.c mpfr-4.2.0-b/src/vasprintf.c
--- mpfr-4.2.0-a/src/vasprintf.c	2023-01-05 17:09:48.000000000 +0000
+++ mpfr-4.2.0-b/src/vasprintf.c	2023-05-17 17:19:35.576201620 +0000
@@ -1888,7 +1888,7 @@
              precision T-1.
              where T is the threshold computed below and X is the exponent
              that would be displayed with style 'e' and precision T-1. */
-          int threshold;
+          mpfr_intmax_t threshold;
           mpfr_exp_t x, e, k;
           struct decimal_info dec_info;
 
@@ -1920,9 +1920,15 @@
           e = e <= 0 ? k : (e + 2) / 3 + (k <= 0 ? 0 : k);
           MPFR_ASSERTD (e >= 1);
 
+          if (e > threshold)
+            e = threshold;
+
+          /* error if e does not fit in size_t (for mpfr_get_str) */
+          if (e > (size_t) -1)
+            goto error;
+
           dec_info.str = mpfr_get_str (NULL, &dec_info.exp, 10,
-                                       e < threshold ? e : threshold,
-                                       p, spec.rnd_mode);
+                                       e, p, spec.rnd_mode);
           register_string (np->sl, dec_info.str);
           /* mpfr_get_str corresponds to a significand between 0.1 and 1,
              whereas here we want a significand between 1 and 10. */
diff -Naurd mpfr-4.2.0-a/src/version.c mpfr-4.2.0-b/src/version.c
--- mpfr-4.2.0-a/src/version.c	2023-05-17 17:17:28.600360192 +0000
+++ mpfr-4.2.0-b/src/version.c	2023-05-17 17:19:35.592201606 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "4.2.0-p8";
+  return "4.2.0-p9";
 }
diff -Naurd mpfr-4.2.0-a/tests/tsprintf.c mpfr-4.2.0-b/tests/tsprintf.c
--- mpfr-4.2.0-a/tests/tsprintf.c	2023-04-17 21:17:39.784645229 +0000
+++ mpfr-4.2.0-b/tests/tsprintf.c	2023-05-17 17:19:35.576201620 +0000
@@ -1620,6 +1620,30 @@
   mpfr_clear (x);
 }
 
+/* On 2023-03-22, on a 64-bit Linux machine (thus with 32-bit int),
+   the case %.2147483648Rg yields an incorrect size computation and
+   MPFR wants to allocate 18446744071562070545 bytes. With assertion
+   checking (--enable-assert), one gets:
+     vasprintf.c:1908: MPFR assertion failed: threshold >= 1
+
+   This case should either succeed or fail as reaching an environmental limit
+   like with glibc (note that the precision does not fit in an int).
+*/
+static void
+large_prec_for_g (void)
+{
+  mpfr_t x;
+  int r;
+
+  mpfr_init2 (x, 128);
+  mpfr_set_ui (x, 1, MPFR_RNDN);
+  r = mpfr_snprintf (NULL, 0, "%.2147483647Rg\n", x);
+  MPFR_ASSERTN (r == 2);
+  r = mpfr_snprintf (NULL, 0, "%.2147483648Rg\n", x);
+  MPFR_ASSERTN (r == 2 || r < 0);
+  mpfr_clear (x);
+}
+
 #if defined(HAVE_LOCALE_H) && defined(HAVE_SETLOCALE)
 
 /* The following tests should be equivalent to those from test_locale()
@@ -1793,6 +1817,7 @@
   percent_n ();
   mixed ();
   check_length_overflow ();
+  large_prec_for_g ();
   test_locale ();
 
   if (getenv ("MPFR_CHECK_LIBC_PRINTF"))
