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Fix PR867 (and maybe 868) and testcsae:

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Transforms/SimplifyCFG/2006-08-03-Crash.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29515 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-08-03 21:40:24 +00:00
parent 006f2d0afd
commit 8cfe6335e4
1 changed files with 25 additions and 6 deletions
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31
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -459,12 +459,31 @@ static bool GatherValueComparisons(Instruction *Cond, Value *&CompVal,
/// has no side effects, nuke it. If it uses any instructions that become dead
/// because the instruction is now gone, nuke them too.
static void ErasePossiblyDeadInstructionTree(Instruction *I) {
if (isInstructionTriviallyDead(I)) {
std::vector<Value*> Operands(I->op_begin(), I->op_end());
I->getParent()->getInstList().erase(I);
for (unsigned i = 0, e = Operands.size(); i != e; ++i)
if (Instruction *OpI = dyn_cast<Instruction>(Operands[i]))
ErasePossiblyDeadInstructionTree(OpI);
if (!isInstructionTriviallyDead(I)) return;
std::vector<Instruction*> InstrsToInspect;
InstrsToInspect.push_back(I);
while (!InstrsToInspect.empty()) {
I = InstrsToInspect.back();
InstrsToInspect.pop_back();
if (!isInstructionTriviallyDead(I)) continue;
// If I is in the work list multiple times, remove previous instances.
for (unsigned i = 0, e = InstrsToInspect.size(); i != e; ++i)
if (InstrsToInspect[i] == I) {
InstrsToInspect.erase(InstrsToInspect.begin()+i);
--i, --e;
}
// Add operands of dead instruction to worklist.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (Instruction *OpI = dyn_cast<Instruction>(I->getOperand(i)))
InstrsToInspect.push_back(OpI);
// Remove dead instruction.
I->eraseFromParent();
}
}