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Implement support for code extracting basic blocks that have a return

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instruction in them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13490 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-05-12 16:07:41 +00:00
parent e746ad512e
commit d99e1d3afb
1 changed files with 12 additions and 2 deletions
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14
lib/Transforms/Utils/CodeExtractor.cpp
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@@ -77,6 +77,7 @@ namespace {
} }
void severSplitPHINodes(BasicBlock *&Header); void severSplitPHINodes(BasicBlock *&Header);
void splitReturnBlocks();
void findInputsOutputs(Values &inputs, Values &outputs); void findInputsOutputs(Values &inputs, Values &outputs);
Function *constructFunction(const Values &inputs, 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. // 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" "No blocks in this region may have entries from outside the region"
" except for the first block!"); " 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); 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(); Function *oldFunction = header->getParent();
// This takes place of the original loop // This takes place of the original loop