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2011 May 16
0
[LLVMdev] InstructionCombining.cpp inconsistency in whether it modifies the CFG?
Hi Michael,
> InstCombine says in its getAnalysisUsage that it preserves the CFG,
> but for the 4th argument in its INITIALIZE_PASS call, it says false,
> which I believe corresponds to whether it preserves the CFG.
that argument should be set to true if the pass only looks at the CFG, i.e.
whatever it computes/does is only a function of the CFG, and doesn't otherwise
depend on what
2011 May 16
2
[LLVMdev] InstructionCombining.cpp inconsistency in whether it modifies the CFG?
InstCombine says in its getAnalysisUsage that it preserves the CFG,
but for the 4th argument in its INITIALIZE_PASS call, it says false,
which I believe corresponds to whether it preserves the CFG. Is this a
mistake, or is there deeper meaning here?
InstructionCombining.cpp:73-82
char InstCombiner::ID = 0;
INITIALIZE_PASS(InstCombiner, "instcombine",
"Combine