Replace a set of Hydrogen instructions with rotate instructions on ARM

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
===================================================================
--- src/hydrogen-instructions.cc	(revision 12582)
+++ src/hydrogen-instructions.cc	(working copy)
@@ -1615,6 +1615,20 @@
 }
 
 
+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: