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avr32: Work around byteswap bug in gcc < 4.2

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gcc versions earlier than 4.2 sign-extends the result of le16_to_cpu()
and friends when we implement __arch__swabX() using
__builtin_bswap_X(). Disable our arch-specific optimizations when those
gcc versions are being used.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen 2008-03-10 12:56:12 +01:00
parent d395991c11
commit bafe68034e
1 changed files with 6 additions and 0 deletions
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6
include/asm-avr32/byteorder.h
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@ -12,8 +12,14 @@ extern unsigned long __builtin_bswap_32(unsigned long x);
extern unsigned short __builtin_bswap_16(unsigned short x);
#endif
/*
* avr32-linux-gcc versions earlier than 4.2 improperly sign-extends
* the result.
*/
#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 2)
#define __arch__swab32(x) __builtin_bswap_32(x)
#define __arch__swab16(x) __builtin_bswap_16(x)
#endif
#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
# define __BYTEORDER_HAS_U64__