GlobalOpt: Optimize in the face of insertvalue/extractvalue
GlobalOpt didn't know how to simulate InsertValueInst or
ExtractValueInst. Optimizing these is pretty straightforward.
N.B. This came up when looking at clang's IRGen for MS ABI member
pointers; they are represented as aggregates.
llvm-svn: 215184
diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
index c1d0d3b..06ee5a8 100644
--- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
@@ -2394,6 +2394,17 @@
getVal(SI->getOperand(2)));
DEBUG(dbgs() << "Found a Select! Simplifying: " << *InstResult
<< "\n");
+ } else if (auto *EVI = dyn_cast<ExtractValueInst>(CurInst)) {
+ InstResult = ConstantExpr::getExtractValue(
+ getVal(EVI->getAggregateOperand()), EVI->getIndices());
+ DEBUG(dbgs() << "Found an ExtractValueInst! Simplifying: " << *InstResult
+ << "\n");
+ } else if (auto *IVI = dyn_cast<InsertValueInst>(CurInst)) {
+ InstResult = ConstantExpr::getInsertValue(
+ getVal(IVI->getAggregateOperand()),
+ getVal(IVI->getInsertedValueOperand()), IVI->getIndices());
+ DEBUG(dbgs() << "Found an InsertValueInst! Simplifying: " << *InstResult
+ << "\n");
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(CurInst)) {
Constant *P = getVal(GEP->getOperand(0));
SmallVector<Constant*, 8> GEPOps;