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Use env var to disable/enable avx512 dispatch #85

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Merged
merged 1 commit into from
Oct 10, 2023
Merged

Use env var to disable/enable avx512 dispatch #85

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8 changes: 5 additions & 3 deletions lib/x86simdsort.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,20 +7,22 @@

static int check_cpu_feature_support(std::string_view cpufeature)
{
if (cpufeature == "avx512_spr")
const char* disable_avx512 = std::getenv("XSS_DISABLE_AVX512");

if ((cpufeature == "avx512_spr") && (!disable_avx512))
#ifdef __FLT16_MAX__
return __builtin_cpu_supports("avx512f")
&& __builtin_cpu_supports("avx512fp16")
&& __builtin_cpu_supports("avx512vbmi2");
#else
return 0;
#endif
else if (cpufeature == "avx512_icl")
else if ((cpufeature == "avx512_icl") && (!disable_avx512))
return __builtin_cpu_supports("avx512f")
&& __builtin_cpu_supports("avx512vbmi2")
&& __builtin_cpu_supports("avx512bw")
&& __builtin_cpu_supports("avx512vl");
else if (cpufeature == "avx512_skx")
else if ((cpufeature == "avx512_skx") && (!disable_avx512))
return __builtin_cpu_supports("avx512f")
&& __builtin_cpu_supports("avx512dq")
&& __builtin_cpu_supports("avx512vl");
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