From a8c5d0872d64a5ae3deaa7ed839a00f72169d3b2 Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Thu, 31 Mar 2011 10:12:15 +0000 Subject: InstCombine: fold fcmp pred (fneg x), C -> fcmp swap(pred) x, -C llvm-svn: 128626 --- llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'llvm/lib/Transforms') diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp index 48ce7cffb58..6743885cd42 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp @@ -2834,6 +2834,14 @@ Instruction *InstCombiner::visitFCmpInst(FCmpInst &I) { return SelectInst::Create(LHSI->getOperand(0), Op1, Op2); break; } + case Instruction::FSub: { + // fcmp pred (fneg x), C -> fcmp swap(pred) x, -C + Value *Op; + if (match(LHSI, m_FNeg(m_Value(Op)))) + return new FCmpInst(I.getSwappedPredicate(), Op, + ConstantExpr::getFNeg(RHSC)); + break; + } case Instruction::Load: if (GetElementPtrInst *GEP = dyn_cast(LHSI->getOperand(0))) { -- cgit v1.2.3