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Add an explicit insert point argument to SplitBlockAndInsertIfThen.

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Currently SplitBlockAndInsertIfThen requires that branch condition is an
Instruction itself, which is very inconvenient, because it is sometimes an
Operator, or even a Constant.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197677 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2013-12-19 13:29:56 +00:00
parent e493a9976c
commit a7eb2b83ba
6 changed files with 62 additions and 42 deletions
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19
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -630,28 +630,29 @@ ReturnInst *llvm::FoldReturnIntoUncondBranch(ReturnInst *RI, BasicBlock *BB,
}
/// SplitBlockAndInsertIfThen - Split the containing block at the
/// specified instruction - everything before and including Cmp stays
/// in the old basic block, and everything after Cmp is moved to a
/// specified instruction - everything before and including SplitBefore stays
/// in the old basic block, and everything after SplitBefore is moved to a
/// new block. The two blocks are connected by a conditional branch
/// (with value of Cmp being the condition).
/// Before:
/// Head
/// Cmp
/// SplitBefore
/// Tail
/// After:
/// Head
/// Cmp
/// if (Cmp)
/// if (Cond)
/// ThenBlock
/// SplitBefore
/// Tail
///
/// If Unreachable is true, then ThenBlock ends with
/// UnreachableInst, otherwise it branches to Tail.
/// Returns the NewBasicBlock's terminator.
TerminatorInst *llvm::SplitBlockAndInsertIfThen(Instruction *Cmp,
bool Unreachable, MDNode *BranchWeights) {
Instruction *SplitBefore = Cmp->getNextNode();
TerminatorInst *llvm::SplitBlockAndInsertIfThen(Value *Cond,
Instruction *SplitBefore,
bool Unreachable,
MDNode *BranchWeights) {
BasicBlock *Head = SplitBefore->getParent();
BasicBlock *Tail = Head->splitBasicBlock(SplitBefore);
TerminatorInst *HeadOldTerm = Head->getTerminator();
@ -663,7 +664,7 @@ TerminatorInst *llvm::SplitBlockAndInsertIfThen(Instruction *Cmp,
else
CheckTerm = BranchInst::Create(Tail, ThenBlock);
BranchInst *HeadNewTerm =
BranchInst::Create(/*ifTrue*/ThenBlock, /*ifFalse*/Tail, Cmp);
BranchInst::Create(/*ifTrue*/ThenBlock, /*ifFalse*/Tail, Cond);
HeadNewTerm->setMetadata(LLVMContext::MD_prof, BranchWeights);
ReplaceInstWithInst(HeadOldTerm, HeadNewTerm);
return CheckTerm;