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Simplify code to emit the unified return block and move it to the end 

of the function.

llvm-svn: 56752
This commit is contained in:
Daniel Dunbar 2008-09-27 07:15:59 +00:00
parent b22ff59750
commit 274ff37583
1 changed files with 4 additions and 12 deletions
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16
clang/lib/CodeGen/CodeGenFunction.cpp
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@ -79,20 +79,12 @@ void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
DI->EmitRegionEnd(CurFn, Builder);
}
// Emit a return for code that falls off the end. If insert point
// is a dummy block with no predecessors then remove the block itself.
llvm::BasicBlock *BB = Builder.GetInsertBlock();
if (isDummyBlock(BB)) {
BB->eraseFromParent();
} else {
// Just transfer to return
Builder.CreateBr(ReturnBlock);
}
assert(BreakContinueStack.empty() &&
"mismatched push/pop in break/continue stack!");
// Emit function epilog (to return).
Builder.SetInsertPoint(ReturnBlock);
// Emit function epilog (to return). This has the nice side effect
// of also automatically handling code that falls off the end.
EmitBlock(ReturnBlock);
EmitFunctionEpilog(FnRetTy, ReturnValue);
// Remove the AllocaInsertPt instruction, which is just a convenience for us.
@ -123,7 +115,7 @@ void CodeGenFunction::StartFunction(const Decl *D, QualType RetTy,
AllocaInsertPt = new llvm::BitCastInst(Undef, llvm::Type::Int32Ty, "allocapt",
EntryBB);
ReturnBlock = llvm::BasicBlock::Create("return", CurFn);
ReturnBlock = llvm::BasicBlock::Create("return");
ReturnValue = 0;
if (!RetTy->isVoidType())
ReturnValue = CreateTempAlloca(ConvertType(RetTy), "retval");