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Generalize isSafeToSpeculativelyExecute to work on arbitrary

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Values, rather than just Instructions, since it's interesting
for ConstantExprs too.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147560 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2012-01-04 23:01:09 +00:00
parent a5f8942e05
commit febaf84017
2 changed files with 6 additions and 2 deletions
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2
include/llvm/Analysis/ValueTracking.h
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@ -174,7 +174,7 @@ namespace llvm {
/// the correct dominance relationships for the operands and users hold. /// the correct dominance relationships for the operands and users hold.
/// However, this method can return true for instructions that read memory; /// However, this method can return true for instructions that read memory;
/// for such instructions, moving them may change the resulting value. /// for such instructions, moving them may change the resulting value.
bool isSafeToSpeculativelyExecute(const Instruction *Inst, bool isSafeToSpeculativelyExecute(const Value *V,
const TargetData *TD = 0); const TargetData *TD = 0);
} // end namespace llvm } // end namespace llvm

6
lib/Analysis/ValueTracking.cpp
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@ -1879,8 +1879,12 @@ bool llvm::onlyUsedByLifetimeMarkers(const Value *V) {
return true; return true;
} }
bool llvm::isSafeToSpeculativelyExecute(const Instruction *Inst, bool llvm::isSafeToSpeculativelyExecute(const Value *V,
const TargetData *TD) { const TargetData *TD) {
const Operator *Inst = dyn_cast<Operator>(V);
if (!Inst)
return false;
for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i) for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i)
if (Constant *C = dyn_cast<Constant>(Inst->getOperand(i))) if (Constant *C = dyn_cast<Constant>(Inst->getOperand(i)))
if (C->canTrap()) if (C->canTrap())