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Let's see what the CPU really says.

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Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>
This commit is contained in:
Steffen Jaeckel 2026-04-15 11:00:59 +02:00
parent ad32540b46
commit c1752846d5
1 changed files with 7 additions and 6 deletions
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13
src/hashes/sha1_desc.c
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@ -54,18 +54,19 @@ static LTC_INLINE int s_sha1_x86_is_supported(void)
if (initialized == 0) {
int regs[4];
int sse2, ssse3, sse41, sha;
int sse2, ssse3, sse41, sha = 0;
/* Leaf 0, Reg 0 contains the number of leafs available */
s_x86_cpuid(regs, 0);
if(regs[0] >= 7) {
s_x86_cpuid(regs, 1);
sse2 = ((((unsigned int)(regs[3])) >> 26) & 1u) != 0; /* SSE2, leaf 1, edx, bit 26 */
ssse3 = ((((unsigned int)(regs[2])) >> 9) & 1u) != 0; /* SSSE3, leaf 1, ecx, bit 9 */
sse41 = ((((unsigned int)(regs[2])) >> 19) & 1u) != 0; /* SSE4.1, leaf 1, ecx, bit 19 */
s_x86_cpuid(regs, 7);
sha = ((((unsigned int)(regs[1])) >> 29) & 1u) != 0; /* SHA, leaf 7, ebx, bit 29 */
is_supported = sse2 && ssse3 && sse41 && sha;
}
s_x86_cpuid(regs, 1);
sse2 = ((((unsigned int)(regs[3])) >> 26) & 1u) != 0; /* SSE2, leaf 1, edx, bit 26 */
ssse3 = ((((unsigned int)(regs[2])) >> 9) & 1u) != 0; /* SSSE3, leaf 1, ecx, bit 9 */
sse41 = ((((unsigned int)(regs[2])) >> 19) & 1u) != 0; /* SSE4.1, leaf 1, ecx, bit 19 */
printf("\nCPU says: %d && %d && %d && %d\n\n", sse2, ssse3, sse41, sha);
is_supported = sse2 && ssse3 && sse41 && sha;
initialized = 1;
}
return is_supported;