MIPS64: Eliminate ABI-dependent definitions.

src/regexp/mips64/regexp-macro-assembler-mips64.cc

Index: src/regexp/mips64/regexp-macro-assembler-mips64.cc
diff --git a/src/regexp/mips64/regexp-macro-assembler-mips64.cc b/src/regexp/mips64/regexp-macro-assembler-mips64.cc
index dff4b79f78ac85cf308597a594e4a9bc95d66181..bf95a9c97ff70e141990c4eab47edd9d71cad813 100644
--- a/src/regexp/mips64/regexp-macro-assembler-mips64.cc
+++ b/src/regexp/mips64/regexp-macro-assembler-mips64.cc
@@ -671,10 +671,7 @@ Handle<HeapObject> RegExpMacroAssemblerMIPS::GetCode(Handle<String> source) {
         s3.bit() | s4.bit() | s5.bit() | s6.bit() | s7.bit() | fp.bit();
     RegList argument_registers = a0.bit() | a1.bit() | a2.bit() | a3.bit();
 
-    if (kMipsAbi == kN64) {
-      // TODO(plind): Should probably alias a4-a7, for clarity.
-      argument_registers |= a4.bit() | a5.bit() | a6.bit() | a7.bit();
-    }
+    argument_registers |= a4.bit() | a5.bit() | a6.bit() | a7.bit();

[balazs.kilvady, 2016/01/28 12:48:22]

I think a4-a7 bits could be 'or'-ed to the above list, separated expression is
not needed.

[Ilija.Pavlovic1, 2016/01/28 15:07:30]

Yes, you are right. I didn't noted that definition is right above this line. I
decided to leave as it is written because this current notation is also readable
and understandable.

Acknowledged.

 
     __ MultiPush(argument_registers | registers_to_retain | ra.bit());
     // Set frame pointer in space for it if this is not a direct call