From 75681bb302e524460edb7c8c5c6e98792b5027a2 Mon Sep 17 00:00:00 2001 From: Nick Lewycky Date: Sat, 13 Jul 2013 01:16:47 +0000 Subject: Add a microoptimization for urem. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186235 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'lib/Transforms') diff --git a/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index e94f719..eac24c6 100644 --- a/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -1125,6 +1125,13 @@ Instruction *InstCombiner::visitURem(BinaryOperator &I) { return BinaryOperator::CreateAnd(Op0, Add); } + // 1 urem X -> zext(X != 1) + if (match(Op0, m_One())) { + Value *Cmp = Builder->CreateICmpNE(Op1, Op0); + Value *Ext = Builder->CreateZExt(Cmp, I.getType()); + return ReplaceInstUsesWith(I, Ext); + } + return 0; } -- cgit v1.1