Replace a set of Hydrogen instructions with rotate instructions on ARM

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1597 matching lines @@
           : new(zone) Range();
       result->Shl(c->Integer32Value());
       result->set_can_be_minus_zero(false);
       return result;
     }
   }
   return HValue::InferRange(zone);
 }
 
 
+Range* HRor::InferRange(Zone* zone) {
+  if (right()->IsConstant()) {
+    HConstant* c = HConstant::cast(right());
+    if (c->HasInteger32Value()) {
+      Range* result = (left()->range() != NULL)
+          ? left()->range()->Copy(zone)
+          : new(zone) Range();

[Erik Corry, 2012/09/27 14:45:44]

Don't you have to Ror the result here?

+      return result;
+    }
+  }
+  return HValue::InferRange(zone);
+}
+
+
 Range* HLoadKeyedSpecializedArrayElement::InferRange(Zone* zone) {
   switch (elements_kind()) {
     case EXTERNAL_PIXEL_ELEMENTS:
       return new(zone) Range(0, 255);
     case EXTERNAL_BYTE_ELEMENTS:
       return new(zone) Range(-128, 127);
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
       return new(zone) Range(0, 255);
     case EXTERNAL_SHORT_ELEMENTS:
       return new(zone) Range(-32768, 32767);
@@ skipping 999 matching lines @@
 
 
 void HCheckPrototypeMaps::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal