[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/Target/AMDGPU/R600ISelLowering.cpp b/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
index da4cf38..6b391de 100644
--- a/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
@@ -1564,8 +1564,9 @@
SDValue Arg = DAG.getLoad(
ISD::UNINDEXED, Ext, VT, DL, Chain,
DAG.getConstant(Offset, DL, MVT::i32), DAG.getUNDEF(MVT::i32), PtrInfo,
- MemVT, /* Alignment = */ 4,
- MachineMemOperand::MONonTemporal | MachineMemOperand::MOInvariant);
+ MemVT, /* Alignment = */ 4, MachineMemOperand::MONonTemporal |
+ MachineMemOperand::MODereferenceable |
+ MachineMemOperand::MOInvariant);
// 4 is the preferred alignment for the CONSTANT memory space.
InVals.push_back(Arg);