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libbb/sha1: optional i686 hardware accelerates hashing

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function                                             old     new   delta
sha1_process_block64_shaNI                             -     524    +524
sha1_begin                                            57     114     +57
.rodata                                           104353  104369     +16
static.shaNI                                           -       1      +1
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 2/0 up/down: 598/0)             Total: 598 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2022-01-07 01:32:13 +01:00
parent 711e20ecb8
commit a96ccbefe4
3 changed files with 252 additions and 1 deletions
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21
libbb/hash_md5_sha.c
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@@ -1143,6 +1143,25 @@ static void FAST_FUNC sha512_process_block128(sha512_ctx_t *ctx)
#endif /* NEED_SHA512 */
#if ENABLE_SHA1_HWACCEL
# if defined(__GNUC__) && defined(__i386__)
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_76_shaNI { char t[1 - 2*(offsetof(sha1_ctx_t, hash) != 76)]; };
void FAST_FUNC sha1_process_block64_shaNI(sha1_ctx_t *ctx);
# endif
# if defined(__GNUC__) && defined(__x86_64__)
static void cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
{
@@ -1174,7 +1193,7 @@ void FAST_FUNC sha1_begin(sha1_ctx_t *ctx)
ctx->total64 = 0;
ctx->process_block = sha1_process_block64;
#if ENABLE_SHA1_HWACCEL
# if defined(__GNUC__) && defined(__x86_64__)
# if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
{
static smallint shaNI;
if (!shaNI) {