From d38f208cd97832babc72abe0f4887fbcb5d44b11 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 24 Feb 2004 18:10:14 +0000 Subject: [PATCH] Fix a faulty optimization on FP values git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11801 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/InstructionCombining.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index fb7dc984923..322112a942e 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/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