commit adbf09e8cfd3aa6bb104f45bf5f39e4e8578d2f8
author Justin Lebar <jlebar@google.com> Sun Sep 11 01:38:58 2016 +0000
committer Justin Lebar <jlebar@google.com> Sun Sep 11 01:38:58 2016 +0000
tree 462f51cead1ea3e5f264f3c84af6e5e94aceda72
parent 4fab7454c5480bc68732ba456bb3aff3ffdedfa0

[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

llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp

diff --git a/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp b/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
index 52eaf6e..95556a7 100644
--- a/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
@@ -2238,7 +2238,8 @@
           SDValue P = DAG.getLoad(
               EltVT, dl, Root, Arg, MachinePointerInfo(SrcValue),
               DL.getABITypeAlignment(EltVT.getTypeForEVT(F->getContext())),
-              MachineMemOperand::MOInvariant);
+              MachineMemOperand::MODereferenceable |
+                  MachineMemOperand::MOInvariant);
           if (P.getNode())
             P.getNode()->setIROrder(idx + 1);
 
@@ -2255,7 +2256,8 @@
           SDValue P = DAG.getLoad(
               VecVT, dl, Root, Arg, MachinePointerInfo(SrcValue),
               DL.getABITypeAlignment(VecVT.getTypeForEVT(F->getContext())),
-              MachineMemOperand::MOInvariant);
+              MachineMemOperand::MODereferenceable |
+                  MachineMemOperand::MOInvariant);
           if (P.getNode())
             P.getNode()->setIROrder(idx + 1);
 
@@ -2297,7 +2299,8 @@
             SDValue P = DAG.getLoad(
                 VecVT, dl, Root, SrcAddr, MachinePointerInfo(SrcValue),
                 DL.getABITypeAlignment(VecVT.getTypeForEVT(F->getContext())),
-                MachineMemOperand::MOInvariant);
+                MachineMemOperand::MODereferenceable |
+                    MachineMemOperand::MOInvariant);
             if (P.getNode())
               P.getNode()->setIROrder(idx + 1);