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Update cpuid.c to optimize intelasm for performance

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Tim
2018-06-06 16:44:46 -06:00
parent 7a4da340d4
commit 59067825fc
1 changed files with 12 additions and 3 deletions
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15
wolfcrypt/src/cpuid.c
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@@ -60,16 +60,26 @@
static word32 cpuid_flag(word32 leaf, word32 sub, word32 num, word32 bit) static word32 cpuid_flag(word32 leaf, word32 sub, word32 num, word32 bit)
{ {
int got_intel_cpu = 0; int got_intel_cpu = 0;
int got_amd_cpu = 0;
unsigned int reg[5]; unsigned int reg[5];
reg[4] = '\0'; reg[4] = '\0';
cpuid(reg, 0, 0); cpuid(reg, 0, 0);
/* check for Intel cpu */
if (XMEMCMP((char *)&(reg[EBX]), "Genu", 4) == 0 && if (XMEMCMP((char *)&(reg[EBX]), "Genu", 4) == 0 &&
XMEMCMP((char *)&(reg[EDX]), "ineI", 4) == 0 && XMEMCMP((char *)&(reg[EDX]), "ineI", 4) == 0 &&
XMEMCMP((char *)&(reg[ECX]), "ntel", 4) == 0) { XMEMCMP((char *)&(reg[ECX]), "ntel", 4) == 0) {
got_intel_cpu = 1; got_intel_cpu = 1;
} }
if (got_intel_cpu) {
/* check for AMD cpu */
if (XMEMCMP((char *)&(reg[EBX]), "Auth", 4) == 0 &&
XMEMCMP((char *)&(reg[EDX]), "enti", 4) == 0 &&
XMEMCMP((char *)&(reg[ECX]), "cAMD", 4) == 0) {
got_amd_cpu = 1;
}
if (got_intel_cpu || got_amd_cpu) {
cpuid(reg, leaf, sub); cpuid(reg, leaf, sub);
return ((reg[num] >> bit) & 0x1); return ((reg[num] >> bit) & 0x1);
} }
@@ -98,4 +108,3 @@
return cpuid_flags; return cpuid_flags;
} }
#endif #endif