[x86] adding PKU feature flag
the feature flag is essential for RDPKRU and WRPKRU instruction
more about the instruction can be found in the SDM rev 56, vol 2 from http://www.intel.com/sdm
Differential Revision: http://reviews.llvm.org/D15491
llvm-svn: 255644
diff --git a/llvm/lib/Target/X86/X86Subtarget.h b/llvm/lib/Target/X86/X86Subtarget.h
index 83bc640..13d1026 100644
--- a/llvm/lib/Target/X86/X86Subtarget.h
+++ b/llvm/lib/Target/X86/X86Subtarget.h
@@ -223,6 +223,9 @@
/// Processor has AVX-512 Vector Length eXtenstions
bool HasVLX;
+ /// Processor has PKU extenstions
+ bool HasPKU;
+
/// Processot supports MPX - Memory Protection Extensions
bool HasMPX;
@@ -398,6 +401,7 @@
bool hasDQI() const { return HasDQI; }
bool hasBWI() const { return HasBWI; }
bool hasVLX() const { return HasVLX; }
+ bool hasPKU() const { return HasPKU; }
bool hasMPX() const { return HasMPX; }
bool isAtom() const { return X86ProcFamily == IntelAtom; }