Add support of RDSEED defined in AVX2 extension

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178314 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index fa991298a6..4132463ee8 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -334,6 +334,10 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
         HasADX = true;
         ToggleFeature(X86::FeatureADX);
       }
+      if (IsIntel && ((EBX >> 18) & 0x1)) {
+        HasRDSEED = true;
+        ToggleFeature(X86::FeatureRDSEED);
+      }
     }
   }
 }
@@ -454,6 +458,7 @@ void X86Subtarget::initializeEnvironment() {
   HasHLE = false;
   HasADX = false;
   HasPRFCHW = false;
+  HasRDSEED = false;
   IsBTMemSlow = false;
   IsUAMemFast = false;
   HasVectorUAMem = false;