93 lines
2.4 KiB
Text
93 lines
2.4 KiB
Text
--- modules/fdlibm/src/math_private.h.orig 2021-09-30 19:32:33.764224000 +0200
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+++ modules/fdlibm/src/math_private.h 2021-10-02 22:15:33.265122000 +0200
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@@ -30,7 +30,11 @@
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* Adapted from https://github.com/freebsd/freebsd-src/search?q=__double_t
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*/
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-typedef double __double_t;
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+#ifdef __LP64__
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+typedef double __double_t;
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+#else
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+typedef long double __double_t;
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+#endif
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typedef __double_t double_t;
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/*
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@@ -630,7 +634,37 @@
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return ((double)(x + 0x1.8p52) - 0x1.8p52);
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}
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+static inline float
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+rnintf(__float_t x)
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+{
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+ /*
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+ * As for rnint(), except we could just call that to handle the
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+ * extra precision case, usually without losing efficiency.
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+ */
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+ return ((float)(x + 0x1.8p23F) - 0x1.8p23F);
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+}
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+
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+#ifdef LDBL_MANT_DIG
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/*
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+ * The complications for extra precision are smaller for rnintl() since it
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+ * can safely assume that the rounding precision has been increased from
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+ * its default to FP_PE on x86. We don't exploit that here to get small
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+ * optimizations from limiting the rangle to double. We just need it for
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+ * the magic number to work with long doubles. ld128 callers should use
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+ * rnint() instead of this if possible. ld80 callers should prefer
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+ * rnintl() since for amd64 this avoids swapping the register set, while
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+ * for i386 it makes no difference (assuming FP_PE), and for other arches
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+ * it makes little difference.
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+ */
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+static inline long double
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+rnintl(long double x)
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+{
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+ return (x + __CONCAT(0x1.8p, LDBL_MANT_DIG) / 2 -
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+ __CONCAT(0x1.8p, LDBL_MANT_DIG) / 2);
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+}
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+#endif /* LDBL_MANT_DIG */
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+
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+/*
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* irint() and i64rint() give the same result as casting to their integer
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* return type provided their arg is a floating point integer. They can
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* sometimes be more efficient because no rounding is required.
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@@ -644,6 +678,39 @@
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sizeof(x) == sizeof(long double) ? irintl(x) : (int)(x))
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#else
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#define irint(x) ((int)(x))
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+#endif
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+
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+#define i64rint(x) ((int64_t)(x)) /* only needed for ld128 so not opt. */
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+
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+#if defined(__i386__) && defined(__GNUCLIKE_ASM)
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+static __inline int
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+irintf(float x)
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+{
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+ int n;
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+
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+ __asm("fistl %0" : "=m" (n) : "t" (x));
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+ return (n);
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+}
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+
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+static __inline int
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+irintd(double x)
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+{
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+ int n;
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+
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+ __asm("fistl %0" : "=m" (n) : "t" (x));
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+ return (n);
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+}
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+#endif
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+
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+#if (defined(__amd64__) || defined(__i386__)) && defined(__GNUCLIKE_ASM)
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+static __inline int
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+irintl(long double x)
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+{
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+ int n;
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+
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+ __asm("fistl %0" : "=m" (n) : "t" (x));
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+ return (n);
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+}
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#endif
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#ifdef DEBUG
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