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Don't muck with phi nodes; bug fixes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44905 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-12-12 02:53:41 +00:00
parent a28c6bfef3
commit 765dff2585
1 changed files with 11 additions and 2 deletions
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13
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -930,8 +930,8 @@ bool CodeGenPrepare::OptimizeExtUses(Instruction *I) {
return false;
// Only safe to perform the optimization if the source is also defined in
// this block.
if (DefBB != cast<Instruction>(Src)->getParent())
// this block.
if (!isa<Instruction>(Src) || DefBB != cast<Instruction>(Src)->getParent())
return false;
bool DefIsLiveOut = false;
@ -948,6 +948,15 @@ bool CodeGenPrepare::OptimizeExtUses(Instruction *I) {
if (!DefIsLiveOut)
return false;
// Make sure non of the uses are PHI nodes.
for (Value::use_iterator UI = Src->use_begin(), E = Src->use_end();
UI != E; ++UI) {
Instruction *User = cast<Instruction>(*UI);
if (User->getParent() == DefBB) continue;
if (isa<PHINode>(User))
return false;
}
// InsertedTruncs - Only insert one trunc in each block once.
DenseMap<BasicBlock*, Instruction*> InsertedTruncs;