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move HoistThenElseCodeToIf up to a more logical and efficient-to-handle place.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-12-13 05:15:29 +00:00
parent ddb97a2bf1
commit ef5002ba85
1 changed files with 11 additions and 7 deletions
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18
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -2145,6 +2145,16 @@ bool SimplifyCFGOpt::run(BasicBlock *BB) {
if (SimplifyBranchOnICmpChain(BI, TD))
return true;
// We have a conditional branch to two blocks that are only reachable
// from BI. We know that the condbr dominates the two blocks, so see if
// there is any identical code in the "then" and "else" blocks. If so, we
// can hoist it up to the branching block.
if (BI->getSuccessor(0)->getSinglePredecessor() != 0 &&
BI->getSuccessor(1)->getSinglePredecessor() != 0)
if (HoistThenElseCodeToIf(BI))
return SimplifyCFG(BB) | true;
// If this is a branch on a phi node in the current block, thread control
// through this block if any PHI node entries are constants.
if (PHINode *PN = dyn_cast<PHINode>(BI->getCondition()))
@ -2327,13 +2337,7 @@ bool SimplifyCFGOpt::run(BasicBlock *BB) {
pred_iterator PI = pred_begin(OtherBB);
++PI;
if (PI == pred_end(OtherBB)) {
// We have a conditional branch to two blocks that are only reachable
// from the condbr. We know that the condbr dominates the two blocks,
// so see if there is any identical code in the "then" and "else"
// blocks. If so, we can hoist it up to the branching block.
Changed |= HoistThenElseCodeToIf(BI);
} else {
if (PI != pred_end(OtherBB)) {
BasicBlock* OnlySucc = NULL;
for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB);
SI != SE; ++SI) {