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simplify a bunch of code.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121685 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-12-13 05:20:28 +00:00
parent ef5002ba85
commit eff7edf126
1 changed files with 4 additions and 15 deletions
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19
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -2334,22 +2334,11 @@ bool SimplifyCFGOpt::run(BasicBlock *BB) {
if (BI && BI->isConditional()) {
// Get the other block.
BasicBlock *OtherBB = BI->getSuccessor(BI->getSuccessor(0) == BB);
pred_iterator PI = pred_begin(OtherBB);
++PI;
if (PI != pred_end(OtherBB)) {
BasicBlock* OnlySucc = NULL;
for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB);
SI != SE; ++SI) {
if (!OnlySucc)
OnlySucc = *SI;
else if (*SI != OnlySucc) {
OnlySucc = 0; // There are multiple distinct successors!
break;
}
}
if (OnlySucc == OtherBB) {
if (OtherBB->getSinglePredecessor() == 0) {
TerminatorInst *BBTerm = BB->getTerminator();
if (BBTerm->getNumSuccessors() == 1 &&
BBTerm->getSuccessor(0) == OtherBB) {
// If BB's only successor is the other successor of the predecessor,
// i.e. a triangle, see if we can hoist any code from this block up
// to the "if" block.