Fix a gross typo: ARMv6+ may or may not support unaligned memory operations.

Even if they are suported by the core, they can be disabled
(this is just a configuration bit inside some register).

Allow unaligned memops on darwin and conservatively disallow them otherwise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94889 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 59c198cb1e..3e42be3132 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -3854,8 +3854,11 @@ bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
   if (!Subtarget->hasV6Ops())
     // Pre-v6 does not support unaligned mem access.
     return false;
-  else if (!Subtarget->hasV6Ops()) {
-    // v6 may or may not support unaligned mem access.
+  else {
+    // v6+ may or may not support unaligned mem access depending on the system
+    // configuration.
+    // FIXME: This is pretty conservative. Should we provide cmdline option to
+    // control the behaviour?
     if (!Subtarget->isTargetDarwin())
       return false;
   }