6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-06 04:31:08 +00:00
Code Issues Projects Releases Wiki Activity

Handle single-entry PHI nodes correctly. This fixes PR877 and

Browse Source 
Transforms/CondProp/2006-08-14-SingleEntryPhiCrash.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-08-14 21:38:05 +00:00
parent a7174736fa
commit df32aac51b
1 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
lib/Transforms/Scalar/CondPropagate.cpp
View File

@ -87,8 +87,18 @@ void CondProp::SimplifyBlock(BasicBlock *BB) {
// If this block ends with an unconditional branch and the only successor has
// only this block as a predecessor, merge the two blocks together.
if (BranchInst *BI = dyn_cast<BranchInst>(BB->getTerminator()))
if (BI->isUnconditional() && BI->getSuccessor(0)->getSinglePredecessor()) {
if (BI->isUnconditional() && BI->getSuccessor(0)->getSinglePredecessor() &&
BB != BI->getSuccessor(0)) {
BasicBlock *Succ = BI->getSuccessor(0);
// If Succ has any PHI nodes, they are all single-entry PHI's.
while (PHINode *PN = dyn_cast<PHINode>(Succ->begin())) {
assert(PN->getNumIncomingValues() == 1 &&
"PHI doesn't match parent block");
PN->replaceAllUsesWith(PN->getIncomingValue(0));
PN->eraseFromParent();
}
// Remove BI.
BI->eraseFromParent();