diff options
| -rw-r--r-- | lib/Transforms/Utils/InlineCost.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/InlineCost.cpp b/lib/Transforms/Utils/InlineCost.cpp index 87aff01..5fe85e6 100644 --- a/lib/Transforms/Utils/InlineCost.cpp +++ b/lib/Transforms/Utils/InlineCost.cpp @@ -42,6 +42,13 @@ unsigned InlineCostAnalyzer::FunctionInfo:: // Figure out if this instruction will be removed due to simple constant // propagation. Instruction &Inst = cast<Instruction>(**UI); + + // We can't constant propagate instructions which have effects or + // read memory. + if (Inst.mayReadFromMemory() || Inst.mayHaveSideEffects() || + isa<AllocationInst>(Inst)) + continue; + bool AllOperandsConstant = true; for (unsigned i = 0, e = Inst.getNumOperands(); i != e; ++i) if (!isa<Constant>(Inst.getOperand(i)) && Inst.getOperand(i) != V) { |