diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/IPO/GlobalOpt.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp index a32e5509545..1522aa408b6 100644 --- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp +++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp @@ -341,6 +341,12 @@ static bool CleanupConstantGlobalUsers(Value *V, Constant *Init, dyn_cast_or_null<ConstantExpr>(ConstantFoldInstruction(GEP, TD, TLI)); if (Init && CE && CE->getOpcode() == Instruction::GetElementPtr) SubInit = ConstantFoldLoadThroughGEPConstantExpr(Init, CE); + + // If the initializer is an all-null value and we have an inbounds GEP, + // we already know what the result of any load from that GEP is. + // TODO: Handle splats. + if (Init && isa<ConstantAggregateZero>(Init) && GEP->isInBounds()) + SubInit = Constant::getNullValue(GEP->getType()->getElementType()); } Changed |= CleanupConstantGlobalUsers(GEP, SubInit, TD, TLI); |
