From 2d79017d85a3e788cf32a8ce1602c2994bfc4ecb Mon Sep 17 00:00:00 2001
From: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Tue, 27 Feb 2018 22:40:52 +0000
Subject: [Pipeliner] Drop memrefs instead of creating ones with size
 UINT64_MAX

Absence of memory operands is treated as "aliasing everything", so
dropping them is sufficient.

Recommit r326256 with a fixed testcase.

llvm-svn: 326262
---
 llvm/lib/CodeGen/MachinePipeliner.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'llvm/lib/CodeGen/MachinePipeliner.cpp')

diff --git a/llvm/lib/CodeGen/MachinePipeliner.cpp b/llvm/lib/CodeGen/MachinePipeliner.cpp
index 3cce7b3..7ee4a99 100644
--- a/llvm/lib/CodeGen/MachinePipeliner.cpp
+++ b/llvm/lib/CodeGen/MachinePipeliner.cpp
@@ -3099,8 +3099,10 @@ void SwingSchedulerDAG::updateMemOperands(MachineInstr &NewMI,
       int64_t AdjOffset = Delta * Num;
       NewMemRefs[Refs++] =
           MF.getMachineMemOperand(MMO, AdjOffset, MMO->getSize());
-    } else
-      NewMemRefs[Refs++] = MF.getMachineMemOperand(MMO, 0, UINT64_MAX);
+    } else {
+      NewMI.dropMemRefs();
+      return;
+    }
   }
   NewMI.setMemRefs(NewMemRefs, NewMemRefs + NumRefs);
 }
-- 
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