From 7467c9b086d3917333ece77e9fc8624922d42ef1 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 18 Apr 2005 04:11:19 +0000 Subject: [PATCH] Another simple xform git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21317 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3058ceafe27..a52289fb387 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -964,6 +964,14 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, return getSetCC(Result, LHS->getValueType(0), LL, LR); } } + + // and/or zext(a), zext(b) -> zext(and/or a, b) + if (N1.getOpcode() == ISD::ZERO_EXTEND && + N2.getOpcode() == ISD::ZERO_EXTEND && + N1.getOperand(0).getValueType() == N2.getOperand(0).getValueType()) + return getNode(ISD::ZERO_EXTEND, VT, + getNode(Opcode, N1.getOperand(0).getValueType(), + N1.getOperand(0), N2.getOperand(0))); break; case ISD::XOR: if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 -- 2.34.1