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remove the ability to get memdep info for vaarg. I don't think the

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original impl was correct and noone actually makes the query anyway.

llvm-svn: 60639
This commit is contained in:
Chris Lattner 2008-12-07 00:21:18 +00:00
parent 3b71e8da68
commit a04521164c
1 changed files with 9 additions and 6 deletions
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15
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -109,6 +109,10 @@ getCallSiteDependency(CallSite CS, BasicBlock::iterator ScanIt, BasicBlock *BB)
MemDepResult MemoryDependenceAnalysis::
getDependencyFrom(Instruction *QueryInst, BasicBlock::iterator ScanIt,
BasicBlock *BB) {
// The first instruction in a block is always non-local.
if (ScanIt == BB->begin())
return MemDepResult::getNonLocal();
// Get the pointer value for which dependence will be determined
Value *MemPtr = 0;
uint64_t MemSize = 0;
@ -122,17 +126,16 @@ getDependencyFrom(Instruction *QueryInst, BasicBlock::iterator ScanIt,
MemPtr = LI->getPointerOperand();
MemSize = TD->getTypeStoreSize(LI->getType());
MemVolatile = LI->isVolatile();
} else if (VAArgInst* V = dyn_cast<VAArgInst>(QueryInst)) {
MemPtr = V->getOperand(0);
MemSize = TD->getTypeStoreSize(V->getType());
} else if (FreeInst* F = dyn_cast<FreeInst>(QueryInst)) {
MemPtr = F->getPointerOperand();
// FreeInsts erase the entire structure, not just a field.
MemSize = ~0UL;
} else {
assert((isa<CallInst>(QueryInst) || isa<InvokeInst>(QueryInst)) &&
"Can only get dependency info for memory instructions!");
} else if (isa<CallInst>(QueryInst) || isa<InvokeInst>(QueryInst)) {
return getCallSiteDependency(CallSite::get(QueryInst), ScanIt, BB);
} else {
// Otherwise, this is a vaarg or non-memory instruction, just return a
// clobber dependency on the previous inst.
return MemDepResult::getClobber(--ScanIt);
}
// Walk backwards through the basic block, looking for dependencies