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libbb/sha1: simplify cpuid code

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function                                             old     new   delta
sha1_begin                                           107     106      -1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2022-01-08 01:25:23 +01:00
parent 805ececa61
commit e7ff29402d
1 changed files with 10 additions and 32 deletions
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40
libbb/hash_md5_sha.c
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@ -1143,43 +1143,21 @@ static void FAST_FUNC sha512_process_block128(sha512_ctx_t *ctx)
#endif /* NEED_SHA512 */ #endif /* NEED_SHA512 */
#if ENABLE_SHA1_HWACCEL #if ENABLE_SHA1_HWACCEL
# if defined(__GNUC__) && defined(__i386__) # if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx) static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
{ {
asm ( asm ("cpuid"
" cpuid\n" : "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx)
: "=a"(*eax), /* Output */ : "0"(*eax), "1"(*ebx), "2"(*ecx), "3"(*edx)
"=b"(*ebx),
"=c"(*ecx),
"=d"(*edx)
: "0"(*eax), /* Input */
"1"(*ebx),
"2"(*ecx),
"3"(*edx)
/* No clobbered registers */
); );
} }
void FAST_FUNC sha1_process_block64_shaNI(sha1_ctx_t *ctx);
# if defined(__i386__)
struct ASM_expects_76_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 76)]; }; struct ASM_expects_76_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 76)]; };
void FAST_FUNC sha1_process_block64_shaNI(sha1_ctx_t *ctx);
# endif # endif
# if defined(__GNUC__) && defined(__x86_64__) # if defined(__x86_64__)
static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
{
asm (
"cpuid\n"
: "=a"(*eax), /* Output */
"=b"(*ebx),
"=c"(*ecx),
"=d"(*edx)
: "0"(*eax), /* Input */
"1"(*ebx),
"2"(*ecx),
"3"(*edx)
/* No clobbered registers */
);
}
struct ASM_expects_80_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 80)]; }; struct ASM_expects_80_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 80)]; };
void FAST_FUNC sha1_process_block64_shaNI(sha1_ctx_t *ctx); # endif
# endif # endif
#endif #endif
@ -1199,7 +1177,7 @@ void FAST_FUNC sha1_begin(sha1_ctx_t *ctx)
if (!shaNI) { if (!shaNI) {
unsigned eax = 7, ebx = ebx, ecx = 0, edx = edx; unsigned eax = 7, ebx = ebx, ecx = 0, edx = edx;
cpuid(&eax, &ebx, &ecx, &edx); cpuid(&eax, &ebx, &ecx, &edx);
shaNI = ((ebx >> 28) & 2) - 1; shaNI = ((ebx >> 29) << 1) - 1;
} }
if (shaNI > 0) if (shaNI > 0)
ctx->process_block = sha1_process_block64_shaNI; ctx->process_block = sha1_process_block64_shaNI;