Add an explicit insert point argument to SplitBlockAndInsertIfThen.

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

View File

@@ -183,27 +183,27 @@ ReturnInst *FoldReturnIntoUncondBranch(ReturnInst *RI, BasicBlock *BB,
BasicBlock *Pred);
/// 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 *SplitBlockAndInsertIfThen(Instruction *Cmp,
bool Unreachable, MDNode *BranchWeights = 0);
TerminatorInst *SplitBlockAndInsertIfThen(Value *Cond, Instruction *SplitBefore,
bool Unreachable,
MDNode *BranchWeights = 0);
///
/// GetIfCondition - Check whether BB is the merge point of a if-region.
@@ -211,7 +211,6 @@ TerminatorInst *SplitBlockAndInsertIfThen(Instruction *Cmp,
/// BB will be taken. Also, return by references the block that will be
/// entered from if the condition is true, and the block that will be
/// entered if the condition is false.
Value *GetIfCondition(BasicBlock *BB, BasicBlock *&IfTrue,
BasicBlock *&IfFalse);
} // End llvm namespace