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Implement support for code extracting basic blocks that have a return 

instruction in them.

llvm-svn: 13490
This commit is contained in:
Chris Lattner 2004-05-12 16:07:41 +00:00
parent 795c9933e2
commit 13d2ddfe9c
1 changed files with 12 additions and 2 deletions
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14
llvm/lib/Transforms/Utils/CodeExtractor.cpp
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@ -77,6 +77,7 @@ namespace {
}
void severSplitPHINodes(BasicBlock *&Header);
void splitReturnBlocks();
void findInputsOutputs(Values &inputs, Values &outputs);
Function *constructFunction(const Values &inputs,
@ -184,8 +185,13 @@ void CodeExtractor::severSplitPHINodes(BasicBlock *&Header) {
}
}
}
}
verifyFunction(*NewBB->getParent());
void CodeExtractor::splitReturnBlocks() {
for (std::set<BasicBlock*>::iterator I = BlocksToExtract.begin(),
E = BlocksToExtract.end(); I != E; ++I)
if (ReturnInst *RI = dyn_cast<ReturnInst>((*I)->getTerminator()))
(*I)->splitBasicBlock(RI, (*I)->getName()+".ret");
}
// findInputsOutputs - Find inputs to, outputs from the code region.
@ -596,9 +602,13 @@ Function *CodeExtractor::ExtractCodeRegion(const std::vector<BasicBlock*> &code)
"No blocks in this region may have entries from outside the region"
" except for the first block!");
// If we have to split PHI nodes, do so now.
// If we have to split PHI nodes or the entry block, do so now.
severSplitPHINodes(header);
// If we have any return instructions in the region, split those blocks so
// that the return is not in the region.
splitReturnBlocks();
Function *oldFunction = header->getParent();
// This takes place of the original loop