[llvm-commits] [llvm] r107114 - /llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Mon Jun 28 20:13:07 2010
New Revision: 107114

URL: http://llvm.org/viewvc/llvm-project?rev=107114&view=rev
Log:
When no memoperands are present, assume unaligned, volatile.

Modified:
    llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp

Modified: llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp?rev=107114&r1=107113&r2=107114&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp Mon Jun 28 20:13:07 2010
@@ -788,18 +788,21 @@
 /// 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.