From 22bb8f5964256f220b9cfdeb48e58964580ed6d5 Mon Sep 17 00:00:00 2001
From: Asaf Badouh <asaf.badouh@intel.com>
Date: Tue, 15 Dec 2015 13:35:29 +0000
Subject: [PATCH] [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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255644 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/Host.cpp            | 2 ++
 lib/Target/X86/X86.td           | 3 +++
 lib/Target/X86/X86InstrInfo.td  | 1 +
 lib/Target/X86/X86Subtarget.cpp | 1 +
 lib/Target/X86/X86Subtarget.h   | 4 ++++
 5 files changed, 11 insertions(+)

diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index d7c9947b02d..c0f9e0744b5 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -812,6 +812,8 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
   Features["rdseed"]   = HasLeaf7 && ((EBX >> 18) & 1);
   Features["adx"]      = HasLeaf7 && ((EBX >> 19) & 1);
   Features["sha"]      = HasLeaf7 && ((EBX >> 29) & 1);
+  // Enable protection keys
+  Features["pku"]    = HasLeaf7 && ((ECX >> 4) & 1);
 
   // AVX512 is only supported if the OS supports the context save for it.
   Features["avx512f"]  = HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save;
diff --git a/lib/Target/X86/X86.td b/lib/Target/X86/X86.td
index 7fc4def15fe..d2055adc99d 100644
--- a/lib/Target/X86/X86.td
+++ b/lib/Target/X86/X86.td
@@ -134,6 +134,8 @@ def FeatureBWI     : SubtargetFeature<"avx512bw", "HasBWI", "true",
 def FeatureVLX     : SubtargetFeature<"avx512vl", "HasVLX", "true",
                       "Enable AVX-512 Vector Length eXtensions",
                                       [FeatureAVX512]>;
+def FeaturePKU   : SubtargetFeature<"pku", "HasPKU", "true",
+                      "Enable protection keys">;
 def FeaturePCLMUL  : SubtargetFeature<"pclmul", "HasPCLMUL", "true",
                          "Enable packed carry-less multiplication instructions",
                                [FeatureSSE2]>;
@@ -491,6 +493,7 @@ class SkylakeProc<string Name> : ProcessorModel<Name, HaswellModel, [
   FeatureDQI,
   FeatureBWI,
   FeatureVLX,
+  FeaturePKU,
   FeatureCMPXCHG16B,
   FeatureSlowBTMem,
   FeaturePOPCNT,
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index f0990fc9d96..f98970cd843 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -771,6 +771,7 @@ def HasVLX       : Predicate<"Subtarget->hasVLX()">,
 def NoVLX        : Predicate<"!Subtarget->hasVLX()">;
 def NoVLX_Or_NoBWI : Predicate<"!Subtarget->hasVLX() || !Subtarget->hasBWI()">;
 def NoVLX_Or_NoDQI : Predicate<"!Subtarget->hasVLX() || !Subtarget->hasDQI()">;
+def PKU        : Predicate<"!Subtarget->hasPKU()">;
 
 def HasPOPCNT    : Predicate<"Subtarget->hasPOPCNT()">;
 def HasAES       : Predicate<"Subtarget->hasAES()">;
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index f90a0b0d04f..8ef08c960f0 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -270,6 +270,7 @@ void X86Subtarget::initializeEnvironment() {
   HasBWI = false;
   HasVLX = false;
   HasADX = false;
+  HasPKU = false;
   HasSHA = false;
   HasPRFCHW = false;
   HasRDSEED = false;
diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index 83bc640976a..13d1026dcaa 100644
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -223,6 +223,9 @@ protected:
   /// 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 @@ public:
   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; }
-- 
2.34.1