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Use bswap instruction on IA-32 too. Optimize bswap_64 on little-endian

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(x86 for now) systems.
This commit is contained in:
gbeauche 2004-01-26 13:52:31 +00:00
parent 6a214d48b0
commit 9da81c79a2
1 changed files with 9 additions and 1 deletions
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10
SheepShaver/src/Unix/sysdeps.h
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@ -139,7 +139,7 @@ typedef int64 intptr;
**/ **/
#if defined(__GNUC__) #if defined(__GNUC__)
#if defined(__x86_64__) #if defined(__x86_64__) || defined(__i386__)
// Linux/AMD64 currently has no asm optimized bswap_32() in <byteswap.h> // Linux/AMD64 currently has no asm optimized bswap_32() in <byteswap.h>
#define opt_bswap_32 do_opt_bswap_32 #define opt_bswap_32 do_opt_bswap_32
static inline uint32 do_opt_bswap_32(uint32 x) static inline uint32 do_opt_bswap_32(uint32 x)
@ -184,6 +184,14 @@ static inline uint32 generic_bswap_32(uint32 x)
((x & 0x000000ff) << 24) ); ((x & 0x000000ff) << 24) );
} }
#if defined(__i386__)
#define opt_bswap_64 do_opt_bswap_64
static inline uint64 do_opt_bswap_64(uint64 x)
{
return (bswap_32(x >> 32) | (((uint64)bswap_32((uint32)x)) << 32));
}
#endif
#ifdef opt_bswap_64 #ifdef opt_bswap_64
#undef bswap_64 #undef bswap_64
#define bswap_64 opt_bswap_64 #define bswap_64 opt_bswap_64