Add ShiftInst::isLogical/ArithmeticShift methods.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30445 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Instructions.h

@@ -16,7 +16,6 @@
 #ifndef LLVM_INSTRUCTIONS_H
 #define LLVM_INSTRUCTIONS_H
 
-#include "llvm/Instruction.h"
 #include "llvm/InstrTypes.h"
 
 namespace llvm {
@@ -633,6 +632,17 @@ public:
   }
   unsigned getNumOperands() const { return 2; }
 
+  /// isLogicalShift - Return true if this is a logical shift left or a logical
+  /// shift right.
+  bool isLogicalShift() const;
+  
+  /// isArithmeticShift - Return true if this is a sign-extending shift right
+  /// operation.
+  bool isArithmeticShift() const {
+    return !isLogicalShift();
+  }
+  
+  
   virtual ShiftInst *clone() const;
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:

lib/VMCore/Instructions.cpp

@@ -1141,6 +1141,17 @@ bool BinaryOperator::swapOperands() {
 }
 
 
+//===----------------------------------------------------------------------===//
+//                               ShiftInst Class
+//===----------------------------------------------------------------------===//
+
+/// isLogicalShift - Return true if this is a logical shift left or a logical
+/// shift right.
+bool ShiftInst::isLogicalShift() const {
+  return getOpcode() == Instruction::Shl || getType()->isUnsigned();
+}
+
+
 //===----------------------------------------------------------------------===//
 //                             SetCondInst Class
 //===----------------------------------------------------------------------===//