From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 29 Jun 2010 01:13:07 +0000 (+0000)
Subject: When no memoperands are present, assume unaligned, volatile.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=628a79771ba6d293ba7b6f2615f022e1ae9c7c49;p=oota-llvm.git

When no memoperands are present, assume unaligned, volatile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107114 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
index 9fc97a80ddf..f80e316d23e 100644
--- a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
+++ b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
@@ -788,18 +788,21 @@ bool ARMLoadStoreOpt::MergeBaseUpdateLoadStore(MachineBasicBlock &MBB,
 /// isMemoryOp - Returns true if instruction is a memory operations (that this
 /// pass is capable of operating on).
 static bool isMemoryOp(const MachineInstr *MI) {
-  if (MI->hasOneMemOperand()) {
-    const MachineMemOperand *MMO = *MI->memoperands_begin();
+  // When no memory operands are present, conservatively assume unaligned,
+  // volatile, unfoldable.
+  if (!MI->hasOneMemOperand())
+    return false;
 
-    // Don't touch volatile memory accesses - we may be changing their order.
-    if (MMO->isVolatile())
-      return false;
+  const MachineMemOperand *MMO = *MI->memoperands_begin();
 
-    // Unaligned ldr/str is emulated by some kernels, but unaligned ldm/stm is
-    // not.
-    if (MMO->getAlignment() < 4)
-      return false;
-  }
+  // Don't touch volatile memory accesses - we may be changing their order.
+  if (MMO->isVolatile())
+    return false;
+
+  // Unaligned ldr/str is emulated by some kernels, but unaligned ldm/stm is
+  // not.
+  if (MMO->getAlignment() < 4)
+    return false;
 
   // str <undef> could probably be eliminated entirely, but for now we just want
   // to avoid making a mess of it.