[CodeGen] Split out the notions of MI invariance and MI dereferenceability.
Summary:
An IR load can be invariant, dereferenceable, neither, or both. But
currently, MI's notion of invariance is IR-invariant &&
IR-dereferenceable.
This patch splits up the notions of invariance and dereferenceability at
the MI level. It's NFC, so adds some probably-unnecessary
"is-dereferenceable" checks, which we can remove later if desired.
Reviewers: chandlerc, tstellarAMD
Subscribers: jholewinski, arsenm, nemanjai, llvm-commits
Differential Revision: https://reviews.llvm.org/D23371
llvm-svn: 281151
diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index 1d961af..d25ea4e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -2183,6 +2183,8 @@
bool IsNonTemporal = I->getMetadata(LLVMContext::MD_nontemporal) != nullptr;
bool IsInvariant = I->getMetadata(LLVMContext::MD_invariant_load) != nullptr;
+ bool IsDereferenceable =
+ I->getMetadata(LLVMContext::MD_dereferenceable) != nullptr;
const MDNode *Ranges = I->getMetadata(LLVMContext::MD_range);
AAMDNodes AAInfo;
@@ -2197,6 +2199,8 @@
Flags |= MachineMemOperand::MOVolatile;
if (IsNonTemporal)
Flags |= MachineMemOperand::MONonTemporal;
+ if (IsDereferenceable)
+ Flags |= MachineMemOperand::MODereferenceable;
if (IsInvariant)
Flags |= MachineMemOperand::MOInvariant;