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Fix the conditions under which SCCP should examine insertvalue

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instructions. Thanks to Matthijs Kooijman for pointing this out!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-06-20 16:39:44 +00:00
parent be20a88f53
commit dfaceb49fc
1 changed files with 18 additions and 1 deletions
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19
lib/Transforms/Scalar/SCCP.cpp
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@ -750,7 +750,7 @@ void SCCPSolver::visitInsertValueInst(InsertValueInst &IVI) {
Value *Val = IVI.getOperand(1);
// If the operand to the getresult is an undef, the result is undef.
if (isa<UndefValue>(Aggr))
if (isa<UndefValue>(Aggr) && isa<UndefValue>(Val))
return;
// Currently only handle single-index insertvalues.
@ -758,6 +758,23 @@ void SCCPSolver::visitInsertValueInst(InsertValueInst &IVI) {
markOverdefined(&IVI);
return;
}
// Currently only handle insertvalue instructions that are in a single-use
// chain that builds up a return value.
for (const InsertValueInst *TmpIVI = &IVI; ; ) {
if (!TmpIVI->hasOneUse()) {
markOverdefined(&IVI);
return;
}
const Value *V = *TmpIVI->use_begin();
if (isa<ReturnInst>(V))
break;
TmpIVI = dyn_cast<InsertValueInst>(V);
if (!TmpIVI) {
markOverdefined(&IVI);
return;
}
}
// See if we are tracking the result of the callee.
Function *F = IVI.getParent()->getParent();