Fix a faulty optimization on FP values

llvm-svn: 11801
2004-02-24 18:10:14 +00:00 · 2004-02-24 18:10:14 +00:00 · 8ee0593f0d
parent a92e58610d
commit 8ee0593f0d
1 changed files with 2 additions and 1 deletions
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@ -441,7 +441,8 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
  Value *LHS = I.getOperand(0), *RHS = I.getOperand(1);

  // X + 0 --> X
-  if (RHS == Constant::getNullValue(I.getType()))
+  if (!I.getType()->isFloatingPoint() &&    // -0 + +0 = +0, so it's not a noop
+      RHS == Constant::getNullValue(I.getType()))
    return ReplaceInstUsesWith(I, LHS);

  // X + X --> X << 1