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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-03-31 10:12:15 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-03-31 10:12:15 +0000 |
| commit | a8c5d0872d64a5ae3deaa7ed839a00f72169d3b2 (patch) | |
| tree | 77b1734d86f98c909b599068c8b27cfb3f6dc3ee /llvm/lib/Transforms | |
| parent | cbb18e91a875361ac15551387b3d8792a8a8cdb4 (diff) | |
| download | bcm5719-llvm-a8c5d0872d64a5ae3deaa7ed839a00f72169d3b2.tar.gz bcm5719-llvm-a8c5d0872d64a5ae3deaa7ed839a00f72169d3b2.zip | |
InstCombine: fold fcmp pred (fneg x), C -> fcmp swap(pred) x, -C
llvm-svn: 128626
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
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<GetElementPtrInst>(LHSI->getOperand(0))) { |
