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AA metadata refactoring (introduce AAMDNodes)

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In order to enable the preservation of noalias function parameter information
after inlining, and the representation of block-level __restrict__ pointer
information (etc.), additional kinds of aliasing metadata will be introduced.
This metadata needs to be carried around in AliasAnalysis::Location objects
(and MMOs at the SDAG level), and so we need to generalize the current scheme
(which is hard-coded to just one TBAA MDNode*).

This commit introduces only the necessary refactoring to allow for the
introduction of other aliasing metadata types, but does not actually introduce
any (that will come in a follow-up commit). What it does introduce is a new
AAMDNodes structure to hold all of the aliasing metadata nodes associated with
a particular memory-accessing instruction, and uses that structure instead of
the raw MDNode* in AliasAnalysis::Location, etc.

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213859 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2014-07-24 12:16:19 +00:00
parent a4abc43a56
commit 2c7c54c86c
50 changed files with 521 additions and 389 deletions
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21
lib/Transforms/Scalar/SROA.cpp
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@ -1148,10 +1148,12 @@ static void speculatePHINodeLoads(PHINode &PN) {
PHINode *NewPN = PHIBuilder.CreatePHI(LoadTy, PN.getNumIncomingValues(),
PN.getName() + ".sroa.speculated");
// Get the TBAA tag and alignment to use from one of the loads. It doesn't
// Get the AA tags and alignment to use from one of the loads. It doesn't
// matter which one we get and if any differ.
LoadInst *SomeLoad = cast<LoadInst>(PN.user_back());
MDNode *TBAATag = SomeLoad->getMetadata(LLVMContext::MD_tbaa);
AAMDNodes AATags;
SomeLoad->getAAMetadata(AATags);
unsigned Align = SomeLoad->getAlignment();
// Rewrite all loads of the PN to use the new PHI.
@ -1172,8 +1174,8 @@ static void speculatePHINodeLoads(PHINode &PN) {
InVal, (PN.getName() + ".sroa.speculate.load." + Pred->getName()));
++NumLoadsSpeculated;
Load->setAlignment(Align);
if (TBAATag)
Load->setMetadata(LLVMContext::MD_tbaa, TBAATag);
if (AATags)
Load->setAAMetadata(AATags);
NewPN->addIncoming(Load, Pred);
}
@ -1238,12 +1240,15 @@ static void speculateSelectInstLoads(SelectInst &SI) {
IRB.CreateLoad(FV, LI->getName() + ".sroa.speculate.load.false");
NumLoadsSpeculated += 2;
// Transfer alignment and TBAA info if present.
// Transfer alignment and AA info if present.
TL->setAlignment(LI->getAlignment());
FL->setAlignment(LI->getAlignment());
if (MDNode *Tag = LI->getMetadata(LLVMContext::MD_tbaa)) {
TL->setMetadata(LLVMContext::MD_tbaa, Tag);
FL->setMetadata(LLVMContext::MD_tbaa, Tag);
AAMDNodes Tags;
LI->getAAMetadata(Tags);
if (Tags) {
TL->setAAMetadata(Tags);
FL->setAAMetadata(Tags);
}
Value *V = IRB.CreateSelect(SI.getCondition(), TL, FL,