From 33b625bee429986b2b3bd11108816d256df39334 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Mon, 2 Jun 2008 22:27:05 +0000 Subject: [PATCH] Fold adds and subtracts of zero immediately, instead of waiting for dagcombine to do this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51886 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index c8f5d534e48..a9b7381a096 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2115,10 +2115,12 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, break; case ISD::OR: case ISD::XOR: + case ISD::ADD: + case ISD::SUB: assert(MVT::isInteger(VT) && N1.getValueType() == N2.getValueType() && N1.getValueType() == VT && "Binary operator types must match!"); - // (X ^| 0) -> X. This commonly occurs when legalizing i64 values, so it's - // worth handling here. + // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so + // it's worth handling here. if (N2C && N2C->isNullValue()) return N1; break; @@ -2128,8 +2130,6 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, case ISD::MULHS: assert(MVT::isInteger(VT) && "This operator does not apply to FP types!"); // fall through - case ISD::ADD: - case ISD::SUB: case ISD::MUL: case ISD::SDIV: case ISD::SREM: