Chris Lattner bf5d4fb7d8 Teach simplifycfg that setcc is cheap and non-trapping, so that it can ...

convert this:

        %tmp.1 = seteq int %i, 0                ; <bool> [#uses=1]
        br bool %tmp.1, label %shortcirc_done, label %shortcirc_next

shortcirc_next:         ; preds = %entry
        %tmp.4 = seteq int %j, 0                ; <bool> [#uses=1]
        br label %shortcirc_done

shortcirc_done:         ; preds = %shortcirc_next, %entry
        %shortcirc_val = phi bool [ %tmp.4, %shortcirc_next ], [ true, %entry ]         ; <bool> [#uses=1]

to this:
        %tmp.1 = seteq int %i, 0                ; <bool> [#uses=1]
        %tmp.4 = seteq int %j, 0                ; <bool> [#uses=1]
        %shortcirc_val = select bool %tmp.1, bool true, bool %tmp.4             ; <bool> [#uses=1]

... which is later simplified by instcombine into an or.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21388 91177308-0d34-0410-b5e6-96231b3b80d8

2005-04-21 05:31:13 +00:00

..

BasicBlockUtils.cpp

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BreakCriticalEdges.cpp

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CloneFunction.cpp

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CloneModule.cpp

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CloneTrace.cpp

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CodeExtractor.cpp

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DemoteRegToStack.cpp

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InlineFunction.cpp

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Local.cpp

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LoopSimplify.cpp

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LowerAllocations.cpp

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LowerInvoke.cpp

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LowerSelect.cpp

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LowerSwitch.cpp

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Makefile

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Mem2Reg.cpp

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PromoteMemoryToRegister.cpp

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SimplifyCFG.cpp

Teach simplifycfg that setcc is cheap and non-trapping, so that it can

2005-04-21 05:31:13 +00:00

UnifyFunctionExitNodes.cpp

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ValueMapper.cpp

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ValueMapper.h

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