[llvm] r367929 - BMI2 support is indicated in bit eight of EBX, not nine.

[Eric Christopher via llvm-commits]

Author: echristo
Date: Mon Aug  5 14:25:59 2019
New Revision: 367929

URL: http://llvm.org/viewvc/llvm-project?rev=367929&view=rev
Log:
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

Modified:
    llvm/trunk/lib/Support/Host.cpp

Modified: llvm/trunk/lib/Support/Host.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Host.cpp?rev=367929&r1=367928&r2=367929&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Host.cpp (original)
+++ llvm/trunk/lib/Support/Host.cpp Mon Aug  5 14:25:59 2019
@@ -1034,7 +1034,7 @@ static void getAvailableFeatures(unsigne
     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);