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Detects AVX2.

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This commit is contained in:
Andrea Mazzoleni 2013-11-05 19:39:46 +01:00
parent a5a3c33854
commit a762c30a46
1 changed files with 19 additions and 10 deletions
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29
cpu.h
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@ -20,7 +20,7 @@
#if defined(__i386__) || defined(__x86_64__)
static inline void cpuid(uint32_t func, uint32_t* reg)
static inline void cpuid(uint32_t func_eax, uint32_t sub_ecx, uint32_t* reg)
{
asm volatile(
#if defined(__i386__) && defined(__PIC__)
@ -29,11 +29,11 @@ static inline void cpuid(uint32_t func, uint32_t* reg)
"cpuid\n"
"xchgl %%ebx, %1\n"
: "=a" (reg[0]), "=r" (reg[1]), "=c" (reg[2]), "=d" (reg[3])
: "0" (func)
: "0" (func_eax), "2" (sub_ecx)
#else
"cpuid\n"
: "=a" (reg[0]), "=b" (reg[1]), "=c" (reg[2]), "=d" (reg[3])
: "0" (func)
: "0" (func_eax), "2" (sub_ecx)
#endif
);
}
@ -45,14 +45,14 @@ static inline void cpu_info(char* vendor, unsigned* family, unsigned* model)
uint32_t reg[4];
unsigned f, ef, m, em;
cpuid(0, reg);
cpuid(0, 0, reg);
((uint32_t*)vendor)[0] = reg[1];
((uint32_t*)vendor)[1] = reg[3];
((uint32_t*)vendor)[2] = reg[2];
vendor[12] = 0;
cpuid(1, reg);
cpuid(1, 0, reg);
f = (reg[0] >> 8) & 0xF;
ef = (reg[0] >> 20) & 0xFF;
@ -77,7 +77,7 @@ static inline int cpu_has_mmx(void)
{
uint32_t reg[4];
cpuid(1, reg);
cpuid(1, 0, reg);
return (reg[3] >> 23) & 1;
}
@ -86,7 +86,7 @@ static inline int cpu_has_sse2(void)
{
uint32_t reg[4];
cpuid(1, reg);
cpuid(1, 0, reg);
return (reg[3] >> 26) & 1;
}
@ -95,7 +95,7 @@ static inline int cpu_has_ssse3(void)
{
uint32_t reg[4];
cpuid(1, reg);
cpuid(1, 0, reg);
return (reg[2] >> 9) & 1;
}
@ -104,7 +104,7 @@ static inline int cpu_has_sse42(void)
{
uint32_t reg[4];
cpuid(1, reg);
cpuid(1, 0, reg);
return (reg[2] >> 20) & 1;
}
@ -113,11 +113,20 @@ static inline int cpu_has_avx(void)
{
uint32_t reg[4];
cpuid(1, reg);
cpuid(1, 0, reg);
return (reg[2] >> 28) & 1;
}
static inline int cpu_has_avx2(void)
{
uint32_t reg[4];
cpuid(7, 0, reg);
return (reg[1] >> 5) & 1;
}
/**
* Check if the processor has a slow MULT implementation.
* If yes, it's better to use a hash not based on multiplication.