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Reuse case destinations. 

llvm-svn: 64100
This commit is contained in:
Anders Carlsson 2009-02-08 22:46:50 +00:00
parent f57b9eef62
commit 9c964ac272
1 changed files with 27 additions and 8 deletions
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35
clang/lib/CodeGen/CodeGenFunction.cpp
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@ -594,16 +594,28 @@ CodeGenFunction::CleanupBlockInfo CodeGenFunction::PopCleanupBlock()
llvm::BranchInst *BI = BranchFixups[i];
llvm::BasicBlock *Dest = BI->getSuccessor(0);
// Store the jump destination before the branch instruction.
llvm::ConstantInt *DI =
llvm::ConstantInt::get(llvm::Type::Int32Ty, i + 1);
new llvm::StoreInst(DI, DestCodePtr, BI);
// Fixup the branch instruction to point to the cleanup block.
BI->setSuccessor(0, CleanupBlock);
if (CleanupEntries.empty()) {
SI->addCase(DI, Dest);
llvm::ConstantInt *ID;
// Check if we already have a destination for this block.
if (Dest == SI->getDefaultDest())
ID = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
else {
ID = SI->findCaseDest(Dest);
if (!ID) {
// No code found, get a new unique one by using the number of
// switch successors.
ID = llvm::ConstantInt::get(llvm::Type::Int32Ty,
SI->getNumSuccessors());
SI->addCase(ID, Dest);
}
}
// Store the jump destination before the branch instruction.
new llvm::StoreInst(ID, DestCodePtr, BI);
} else {
// We need to jump through another cleanup block. Create a pad block
// with a branch instruction that jumps to the final destination and
@ -611,9 +623,16 @@ CodeGenFunction::CleanupBlockInfo CodeGenFunction::PopCleanupBlock()
// Create the pad block.
llvm::BasicBlock *CleanupPad = createBasicBlock("cleanup.pad", CurFn);
// Create a unique case ID.
llvm::ConstantInt *ID = llvm::ConstantInt::get(llvm::Type::Int32Ty,
SI->getNumSuccessors());
// Store the jump destination before the branch instruction.
new llvm::StoreInst(ID, DestCodePtr, BI);
// Add it as the destination.
SI->addCase(DI, CleanupPad);
SI->addCase(ID, CleanupPad);
// Create the branch to the final destination.
llvm::BranchInst *BI = llvm::BranchInst::Create(Dest);