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Fix #29259: cycles issues on certain processors. Now two versions of the kernel

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are compiled, one SSE optimized and the other not, and it will choose between
them at runtime.
This commit is contained in:
Brecht Van Lommel
2011-11-15 15:13:38 +00:00
parent 2bc7821913
commit db8024f4b5
8 changed files with 226 additions and 45 deletions
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73
intern/cycles/util/util_system.cpp
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@@ -118,5 +118,78 @@ int system_cpu_bits()
return (sizeof(void*)*8);
}
#if defined(__x86_64__) || defined(_M_X64) || defined(i386) || defined(_M_IX86)
struct CPUCapabilities {
bool x64;
bool mmx;
bool sse;
bool sse2;
bool sse3;
bool ssse3;
bool sse41;
bool sse42;
bool sse4a;
bool avx;
bool xop;
bool fma3;
bool fma4;
};
bool system_cpu_support_optimized()
{
static CPUCapabilities caps;
static bool caps_init = false;
if(!caps_init) {
int result[4], num, num_ex;
memset(&caps, 0, sizeof(caps));
__cpuid(result, 0);
num = result[0];
__cpuid(result, 0x80000000);
num_ex = result[0];
if(num >= 1){
__cpuid(result, 0x00000001);
caps.mmx = (result[3] & ((int)1 << 23)) != 0;
caps.sse = (result[3] & ((int)1 << 25)) != 0;
caps.sse2 = (result[3] & ((int)1 << 26)) != 0;
caps.sse3 = (result[2] & ((int)1 << 0)) != 0;
caps.ssse3 = (result[2] & ((int)1 << 9)) != 0;
caps.sse41 = (result[2] & ((int)1 << 19)) != 0;
caps.sse42 = (result[2] & ((int)1 << 20)) != 0;
caps.avx = (result[2] & ((int)1 << 28)) != 0;
caps.fma3 = (result[2] & ((int)1 << 12)) != 0;
}
/*if(num_ex >= 0x80000001){
__cpuid(result, 0x80000001);
caps.x64 = (result[3] & ((int)1 << 29)) != 0;
caps.sse4a = (result[2] & ((int)1 << 6)) != 0;
caps.fma4 = (result[2] & ((int)1 << 16)) != 0;
caps.xop = (result[2] & ((int)1 << 11)) != 0;
}*/
caps_init = true;
}
/* optimization flags use these */
return caps.sse && caps.sse2 && caps.sse3;
}
#else
bool system_cpu_support_optimized()
{
return false;
}
#endif
CCL_NAMESPACE_END