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BMI2 support is indicated in bit eight of EBX, not nine. 

See Intel SDM, Vol 2A, Table 3-8:
https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-2a-manual.pdf#page=296

Differential Revision: https://reviews.llvm.org/D65766

llvm-svn: 367929
This commit is contained in:
Eric Christopher 2019-08-05 21:25:59 +00:00
parent 23f073100d
commit 1d73e228db
2 changed files with 2 additions and 2 deletions
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2
compiler-rt/lib/builtins/cpu_model.c
View File

@ -543,7 +543,7 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf,
setFeature(FEATURE_BMI);
if (HasLeaf7 && ((EBX >> 5) & 1) && HasAVX)
setFeature(FEATURE_AVX2);
if (HasLeaf7 && ((EBX >> 9) & 1))
if (HasLeaf7 && ((EBX >> 8) & 1))
setFeature(FEATURE_BMI2);
if (HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save)
setFeature(FEATURE_AVX512F);

2
llvm/lib/Support/Host.cpp
View File

@ -1034,7 +1034,7 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf,
setFeature(X86::FEATURE_BMI);
if (HasLeaf7 && ((EBX >> 5) & 1) && HasAVX)
setFeature(X86::FEATURE_AVX2);
if (HasLeaf7 && ((EBX >> 9) & 1))
if (HasLeaf7 && ((EBX >> 8) & 1))
setFeature(X86::FEATURE_BMI2);
if (HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save)
setFeature(X86::FEATURE_AVX512F);