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Cycles: Control CPU capabilities via environment variables

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Purely developers-only feature which allows to disable some of the CPU
capabilities. This way it's easier to test different kernels on the
same machine.
This commit is contained in:
Sergey Sharybin
2015-02-11 01:55:35 +05:00
parent 28e76bbb93
commit 4b04a4e2ff
1 changed files with 25 additions and 0 deletions
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25
intern/cycles/util/util_system.cpp
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@@ -135,6 +135,29 @@ struct CPUCapabilities {
bool bmi2;
};
static void system_cpu_capabilities_override(CPUCapabilities *caps)
{
/* Only capabilities which affects on cycles kernel. */
if(getenv("CYCLES_CPU_NO_AVX2")) {
caps->avx2 = false;
}
if(getenv("CYCLES_CPU_NO_AVX")) {
caps->avx = false;
}
if(getenv("CYCLES_CPU_NO_SSE41")) {
caps->sse41 = false;
}
if(getenv("CYCLES_CPU_NO_SSE3")) {
caps->sse3 = false;
}
if(getenv("CYCLES_CPU_NO_SSE2")) {
caps->sse2 = false;
}
if(getenv("CYCLES_CPU_NO_SSE")) {
caps->sse = false;
}
}
static CPUCapabilities& system_cpu_capabilities()
{
static CPUCapabilities caps;
@@ -200,6 +223,8 @@ static CPUCapabilities& system_cpu_capabilities()
}
#endif
system_cpu_capabilities_override(&caps);
caps_init = true;
}