[llvm-commits] CVS: llvm/lib/Transforms/Scalar/InstructionCombining.cpp

[Chris Lattner]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.92 -> 1.93

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Log message:

Instcombine:  X * -1 -> -X


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Diffs of the changes:

Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.92 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.93
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.92	Mon Jun 23 16:59:52 2003
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Wed Jun 25 12:09:20 2003
@@ -361,10 +361,11 @@
   if (Constant *Op1 = dyn_cast<Constant>(I.getOperand(1))) {
     if (ConstantInt *CI = dyn_cast<ConstantInt>(Op1)) {
       const Type *Ty = CI->getType();
-      uint64_t Val = Ty->isSigned() ?
-                          (uint64_t)cast<ConstantSInt>(CI)->getValue() : 
-                                    cast<ConstantUInt>(CI)->getValue();
+      int64_t Val = Ty->isSigned() ?        cast<ConstantSInt>(CI)->getValue() :
+                                   (int64_t)cast<ConstantUInt>(CI)->getValue();
       switch (Val) {
+      case -1:                               // X * -1 -> -X
+        return BinaryOperator::createNeg(Op0, I.getName());
       case 0:
         return ReplaceInstUsesWith(I, Op1);  // Eliminate 'mul double %X, 0'
       case 1: