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[CGP] convert chain of 'if' to 'switch'; NFC 

This should be extended, but CGP does some strange things,
so I'm intentionally not changing the potential order of
any transforms yet.

llvm-svn: 356566
This commit is contained in:
Sanjay Patel 2019-03-20 15:53:06 +00:00
parent 538fb72226
commit d1ce455f7b
1 changed files with 13 additions and 14 deletions
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27
llvm/lib/CodeGen/CodeGenPrepare.cpp
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@ -6876,6 +6876,7 @@ bool CodeGenPrepare::optimizeInst(Instruction *I, DominatorTree &DT,
if (InsertedInsts.count(I))
return false;
// TODO: Move into the switch on opcode below here.
if (PHINode *P = dyn_cast<PHINode>(I)) {
// It is possible for very late stage optimizations (such as SimplifyCFG)
// to introduce PHI nodes too late to be cleaned up. If we detect such a
@ -6994,20 +6995,18 @@ bool CodeGenPrepare::optimizeInst(Instruction *I, DominatorTree &DT,
if (tryToSinkFreeOperands(I))
return true;
if (CallInst *CI = dyn_cast<CallInst>(I))
return optimizeCallInst(CI, ModifiedDT);
if (SelectInst *SI = dyn_cast<SelectInst>(I))
return optimizeSelectInst(SI, ModifiedDT);
if (ShuffleVectorInst *SVI = dyn_cast<ShuffleVectorInst>(I))
return optimizeShuffleVectorInst(SVI);
if (auto *Switch = dyn_cast<SwitchInst>(I))
return optimizeSwitchInst(Switch);
if (isa<ExtractElementInst>(I))
return optimizeExtractElementInst(I);
switch (I->getOpcode()) {
case Instruction::Call:
return optimizeCallInst(cast<CallInst>(I), ModifiedDT);
case Instruction::Select:
return optimizeSelectInst(cast<SelectInst>(I), ModifiedDT);
case Instruction::ShuffleVector:
return optimizeShuffleVectorInst(cast<ShuffleVectorInst>(I));
case Instruction::Switch:
return optimizeSwitchInst(cast<SwitchInst>(I));
case Instruction::ExtractElement:
return optimizeExtractElementInst(cast<ExtractElementInst>(I));
}
return false;
}