[v8-dev] ARM: Improve Lithium register constraints.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 887168cc755d6779be50924c417fb3c79d9b776f..d923aa2846c65051d4ec4c9f02f5531d78d8fbff 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -3478,10 +3478,16 @@ class HBinaryOperation: public HTemplateInstruction<3> {
     if (left()->IsConstant()) return true;
     if (right()->IsConstant()) return false;
 
+#ifdef V8_BETTER_OPERAND_ON_RIGHT
+    // Otherwise, if there is only one use of the left operand, the define
+    // says it would be better off on the right.
+    return (left()->UseCount() == 1);
+#else
     // Otherwise, if there is only one use of the right operand, it would be
     // better off on the left for platforms that only have 2-arg arithmetic
     // ops (e.g ia32, x64) that clobber the left operand.
     return right()->UseCount() == 1;
+#endif
   }
 
   HValue* BetterLeftOperand() {