From: Craig Topper Date: Wed, 19 Dec 2012 06:12:28 +0000 (+0000) Subject: Teach SimplifySetCC that comparing AssertZext i1 against a constant 1 can be rewritte... X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=40b4a81ab007c11c2d4227b4f6a949720ba2adff;p=oota-llvm.git Teach SimplifySetCC that comparing AssertZext i1 against a constant 1 can be rewritten as a compare against a constant 0 with the opposite condition. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170495 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 1dadd1f25a9..aa0c5cb0db5 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -2206,9 +2206,10 @@ TargetLowering::SimplifySetCC(EVT VT, SDValue N0, SDValue N1, Cond = (Cond == ISD::SETEQ) ? ISD::SETNE : ISD::SETEQ; return DAG.getSetCC(dl, VT, Op0.getOperand(0), Op0.getOperand(1), Cond); - } else if (Op0.getOpcode() == ISD::AND && - isa(Op0.getOperand(1)) && - cast(Op0.getOperand(1))->getAPIntValue() == 1) { + } + if (Op0.getOpcode() == ISD::AND && + isa(Op0.getOperand(1)) && + cast(Op0.getOperand(1))->getAPIntValue() == 1) { // If this is (X&1) == / != 1, normalize it to (X&1) != / == 0. if (Op0.getValueType().bitsGT(VT)) Op0 = DAG.getNode(ISD::AND, dl, VT, @@ -2223,6 +2224,11 @@ TargetLowering::SimplifySetCC(EVT VT, SDValue N0, SDValue N1, DAG.getConstant(0, Op0.getValueType()), Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ); } + if (Op0.getOpcode() == ISD::AssertZext && + cast(Op0.getOperand(1))->getVT() == MVT::i1) + return DAG.getSetCC(dl, VT, Op0, + DAG.getConstant(0, Op0.getValueType()), + Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ); } } diff --git a/test/CodeGen/X86/cmp.ll b/test/CodeGen/X86/cmp.ll index eb06327f55a..1855fe2fb89 100644 --- a/test/CodeGen/X86/cmp.ll +++ b/test/CodeGen/X86/cmp.ll @@ -151,3 +151,18 @@ entry: %conv = zext i1 %cmp to i32 ret i32 %conv } + +define i32 @test12() uwtable ssp { +; CHECK: test12: +; CHECK: testb + %1 = call zeroext i1 @test12b() + br i1 %1, label %2, label %3 + +;