1 files changed, 22 insertions, 10 deletions
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 586bb7bd7b1a5..92a68759195c8 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -11,19 +11,23 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "MCTargetDesc/X86BaseInfo.h"
 #include "X86Subtarget.h"
-#include "X86InstrInfo.h"
 #include "X86TargetMachine.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/IR/Attributes.h"
+#include "llvm/IR/ConstantRange.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalValue.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/CodeGen.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Host.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
+#include <cassert>
+#include <string>
 
 #if defined(_MSC_VER)
 #include <intrin.h>
@@ -93,8 +97,17 @@ unsigned char X86Subtarget::classifyGlobalReference(const GlobalValue *GV,
     return X86II::MO_NO_FLAG;
 
   // Absolute symbols can be referenced directly.
-  if (GV && GV->isAbsoluteSymbolRef())
-    return X86II::MO_NO_FLAG;
+  if (GV) {
+    if (Optional<ConstantRange> CR = GV->getAbsoluteSymbolRange()) {
+      // See if we can use the 8-bit immediate form. Note that some instructions
+      // will sign extend the immediate operand, so to be conservative we only
+      // accept the range [0,128).
+      if (CR->getUnsignedMax().ult(128))
+        return X86II::MO_ABS8;
+      else
+        return X86II::MO_NO_FLAG;
+    }
+  }
 
   if (TM.shouldAssumeDSOLocal(M, GV))
     return classifyLocalReference(GV);
@@ -195,7 +208,6 @@ void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
       FullFS = "+sahf";
   }
 
-
   // Parse features string and set the CPU.
   ParseSubtargetFeatures(CPUName, FullFS);
 
@@ -263,7 +275,6 @@ void X86Subtarget::initializeEnvironment() {
   HasVBMI = false;
   HasIFMA = false;
   HasRTM = false;
-  HasHLE = false;
   HasERI = false;
   HasCDI = false;
   HasPFI = false;
@@ -277,6 +288,7 @@ void X86Subtarget::initializeEnvironment() {
   HasRDSEED = false;
   HasLAHFSAHF = false;
   HasMWAITX = false;
+  HasCLZERO = false;
   HasMPX = false;
   IsBTMemSlow = false;
   IsPMULLDSlow = false;
@@ -286,10 +298,11 @@ void X86Subtarget::initializeEnvironment() {
   HasSSEUnalignedMem = false;
   HasCmpxchg16b = false;
   UseLeaForSP = false;
-  HasFastPartialYMMWrite = false;
+  HasFastPartialYMMorZMMWrite = false;
   HasFastScalarFSQRT = false;
   HasFastVectorFSQRT = false;
   HasFastLZCNT = false;
+  HasFastSHLDRotate = false;
   HasSlowDivide32 = false;
   HasSlowDivide64 = false;
   PadShortFunctions = false;
@@ -321,7 +334,7 @@ X86Subtarget::X86Subtarget(const Triple &TT, StringRef CPU, StringRef FS,
                   TargetTriple.getEnvironment() != Triple::CODE16),
       In16BitMode(TargetTriple.getArch() == Triple::x86 &&
                   TargetTriple.getEnvironment() == Triple::CODE16),
-      TSInfo(), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
+      InstrInfo(initializeSubtargetDependencies(CPU, FS)),
       TLInfo(TM, *this), FrameLowering(*this, getStackAlignment()) {
   // Determine the PICStyle based on the target selected.
   if (!isPositionIndependent())
@@ -359,4 +372,3 @@ const RegisterBankInfo *X86Subtarget::getRegBankInfo() const {
 bool X86Subtarget::enableEarlyIfConversion() const {
   return hasCMov() && X86EarlyIfConv;
 }
-