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Mark dead physregdefs dead immediately. This helps MachineSink and
MachineLICM and other things which run before LiveVariables is run. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85360 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -571,6 +571,8 @@ void InstrEmitter::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
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unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
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if (Node->hasAnyUseOfValue(i))
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EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
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else
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MI->addRegisterDead(Reg, TRI);
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}
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}
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return;
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@ -41,3 +41,18 @@ bb:
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return:
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ret void
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}
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; Sink instructions with dead EFLAGS defs.
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; CHECK: je
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; CHECK-NEXT: orb
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define zeroext i8 @zzz(i8 zeroext %a, i8 zeroext %b) nounwind readnone {
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entry:
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%tmp = zext i8 %a to i32 ; <i32> [#uses=1]
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%tmp2 = icmp eq i8 %a, 0 ; <i1> [#uses=1]
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%tmp3 = or i8 %b, -128 ; <i8> [#uses=1]
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%tmp4 = and i8 %b, 127 ; <i8> [#uses=1]
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%b_addr.0 = select i1 %tmp2, i8 %tmp4, i8 %tmp3 ; <i8> [#uses=1]
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ret i8 %b_addr.0
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}
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