From a4f445b28c3c55949e6be72514f4225c95dc87a9 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 10 Mar 2003 23:23:04 +0000 Subject: [PATCH] Implement: -A*-B == A*B git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5740 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/InstructionCombining.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 79a551f70c8..067a884bc9d 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -342,6 +342,10 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) { } } + if (Value *Op0v = dyn_castNegVal(Op0)) // -X * -Y = X*Y + if (Value *Op1v = dyn_castNegVal(I.getOperand(1))) + return BinaryOperator::create(Instruction::Mul, Op0v, Op1v); + return Changed ? &I : 0; } -- 2.40.0