AA metadata refactoring (introduce AAMDNodes)

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.

llvm-svn: 213859

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index ad75e916cef..ee23e7066a5 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -2158,9 +2158,11 @@ FastISel::createMachineMemOperandFor(const Instruction *I) const {
 
   bool IsNonTemporal = I->getMetadata("nontemporal") != nullptr;
   bool IsInvariant = I->getMetadata("invariant.load") != nullptr;
-  const MDNode *TBAAInfo = I->getMetadata(LLVMContext::MD_tbaa);
   const MDNode *Ranges = I->getMetadata(LLVMContext::MD_range);
 
+  AAMDNodes AAInfo;
+  I->getAAMetadata(AAInfo);
+
   if (Alignment == 0)  // Ensure that codegen never sees alignment 0.
     Alignment = DL.getABITypeAlignment(ValTy);
 
@@ -2174,5 +2176,5 @@ FastISel::createMachineMemOperandFor(const Instruction *I) const {
     Flags |= MachineMemOperand::MOInvariant;
 
   return FuncInfo.MF->getMachineMemOperand(MachinePointerInfo(Ptr), Flags, Size,
-                                           Alignment, TBAAInfo, Ranges);
+                                           Alignment, AAInfo, Ranges);
 }