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Remove setPreservesCFG from instcombine. The pass, in particular, does not

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preserve LoopSimplify because instcombine may replace branch predicates
with undef which loop simplify then replaces with always exit.  Replace
setPreservesCFG with the more constrained preservation of DomTree and
LoopInfo.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221223 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mark Heffernan 2014-11-04 01:51:01 +00:00
parent 58206dd147
commit f4b76be936
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -90,7 +90,8 @@ INITIALIZE_PASS_END(InstCombiner, "instcombine",
"Combine redundant instructions", false, false)
void InstCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
AU.addPreserved<DominatorTreeWrapperPass>();
AU.addPreserved<LoopInfo>();
AU.addRequired<AssumptionTracker>();
AU.addRequired<TargetLibraryInfo>();
}