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Handle addrspacecast when looking at memcpys from globals

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-04-24 00:01:09 +00:00
parent 9f2150c046
commit 8bd9405026
2 changed files with 69 additions and 7 deletions
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lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+6 -3
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@@ -31,10 +31,13 @@ STATISTIC(NumGlobalCopies, "Number of allocas copied from constant global");
static bool pointsToConstantGlobal(Value *V) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
return GV->isConstant();
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
if (CE->getOpcode() == Instruction::BitCast ||
CE->getOpcode() == Instruction::AddrSpaceCast ||
CE->getOpcode() == Instruction::GetElementPtr)
return pointsToConstantGlobal(CE->getOperand(0));
}
return false;
}
@@ -62,9 +65,9 @@ isOnlyCopiedFromConstantGlobal(Value *V, MemTransferInst *&TheCopy,
continue;
}
if (BitCastInst *BCI = dyn_cast<BitCastInst>(I)) {
if (isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I)) {
// If uses of the bitcast are ok, we are ok.
if (!isOnlyCopiedFromConstantGlobal(BCI, TheCopy, ToDelete, IsOffset))
if (!isOnlyCopiedFromConstantGlobal(I, TheCopy, ToDelete, IsOffset))
return false;
continue;
}