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PR1255(case ranges) related changes in Local Transformations.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157315 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stepan Dyatkovskiy 2012-05-23 08:18:26 +00:00
parent 88097819fc
commit a2067fbe22
1 changed files with 12 additions and 8 deletions
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20
lib/Transforms/Utils/Local.cpp
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@ -169,16 +169,20 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB, bool DeleteDeadConditions) {
// Otherwise, we can fold this switch into a conditional branch
// instruction if it has only one non-default destination.
SwitchInst::CaseIt FirstCase = SI->case_begin();
Value *Cond = Builder.CreateICmpEQ(SI->getCondition(),
FirstCase.getCaseValue(), "cond");
ConstantRangesSet CRS = FirstCase.getCaseValueEx();
if (CRS.getNumItems() == 1 && CRS.isSingleNumber(0)) {
Value *Cond = Builder.CreateICmpEQ(SI->getCondition(),
CRS.getItem(0).Low, "cond");
// Insert the new branch.
Builder.CreateCondBr(Cond, FirstCase.getCaseSuccessor(),
SI->getDefaultDest());
// Insert the new branch.
Builder.CreateCondBr(Cond, FirstCase.getCaseSuccessor(),
SI->getDefaultDest());
// Delete the old switch.
SI->eraseFromParent();
return true;
// Delete the old switch.
SI->eraseFromParent();
return true;
}
}
return false;
}