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Do not sink any instruction with side effects, including vaarg. This fixes

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PR640


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24046 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-10-27 17:13:11 +00:00
parent cbbc6b74e3
commit 108e902aeb
1 changed files with 2 additions and 4 deletions
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6
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -5717,8 +5717,8 @@ void InstCombiner::removeFromWorkList(Instruction *I) {
static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) {
assert(I->hasOneUse() && "Invariants didn't hold!");
// Cannot move control-flow-involving instructions.
if (isa<PHINode>(I) || isa<InvokeInst>(I) || isa<CallInst>(I)) return false;
// Cannot move control-flow-involving, volatile loads, vaarg, etc.
if (isa<PHINode>(I) || I->mayWriteToMemory()) return false;
// Do not sink alloca instructions out of the entry block.
if (isa<AllocaInst>(I) && I->getParent() == &DestBlock->getParent()->front())
@ -5727,8 +5727,6 @@ static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) {
// We can only sink load instructions if there is nothing between the load and
// the end of block that could change the value.
if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
if (LI->isVolatile()) return false; // Don't sink volatile loads.
for (BasicBlock::iterator Scan = LI, E = LI->getParent()->end();
Scan != E; ++Scan)
if (Scan->mayWriteToMemory())