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Mark dead physregdefs dead immediately. This helps MachineSink and

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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
This commit is contained in:
Dan Gohman 2009-10-28 01:13:53 +00:00
parent 83f6120c9a
commit a104d1eab2
2 changed files with 17 additions and 0 deletions
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2
lib/CodeGen/SelectionDAG/InstrEmitter.cpp
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@ -571,6 +571,8 @@ void InstrEmitter::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
if (Node->hasAnyUseOfValue(i))
EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
else
MI->addRegisterDead(Reg, TRI);
}
}
return;

15
test/CodeGen/X86/sink-hoist.ll
View File

@ -41,3 +41,18 @@ bb:
return:
ret void
}
; Sink instructions with dead EFLAGS defs.
; CHECK: je
; CHECK-NEXT: orb
define zeroext i8 @zzz(i8 zeroext %a, i8 zeroext %b) nounwind readnone {
entry:
%tmp = zext i8 %a to i32 ; <i32> [#uses=1]
%tmp2 = icmp eq i8 %a, 0 ; <i1> [#uses=1]
%tmp3 = or i8 %b, -128 ; <i8> [#uses=1]
%tmp4 = and i8 %b, 127 ; <i8> [#uses=1]
%b_addr.0 = select i1 %tmp2, i8 %tmp4, i8 %tmp3 ; <i8> [#uses=1]
ret i8 %b_addr.0
}