MIPS: Branch delay slot and other optimizations.

src/mips/builtins-mips.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 49 matching lines @@
 
   // Insert extra arguments.
   int num_extra_args = 0;
   if (extra_args == NEEDS_CALLED_FUNCTION) {
     num_extra_args = 1;
     __ push(a1);
   } else {
     ASSERT(extra_args == NO_EXTRA_ARGUMENTS);
   }
 
-  // JumpToExternalReference expects a0 to contain the number of arguments
+  // JumpToExternalReference expects s0 to contain the number of arguments
   // including the receiver and the extra arguments.
-  __ Addu(a0, a0, Operand(num_extra_args + 1));
+  __ Addu(s0, a0, num_extra_args + 1);
+  __ sll(s1, s0, kPointerSizeLog2);
+  __ Subu(s1, s1, kPointerSize);
   __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
 }
 
 
 // Load the built-in InternalArray function from the current context.
 static void GenerateLoadInternalArrayFunction(MacroAssembler* masm,
                                               Register result) {
   // Load the global context.
 
   __ lw(result, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
@@ skipping 1713 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(a3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS