MIPS: Improve allocate locals to reduce code size.

src/mips/full-codegen-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 161 matching lines @@
 
   info->set_prologue_offset(masm_->pc_offset());
   __ Prologue(BUILD_FUNCTION_FRAME);
   info->AddNoFrameRange(0, masm_->pc_offset());
 
   { Comment cmnt(masm_, "[ Allocate locals");
     int locals_count = info->scope()->num_stack_slots();
     // Generators allocate locals, if any, in context slots.
     ASSERT(!info->function()->is_generator() || locals_count == 0);
     if (locals_count > 0) {
-      __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
       // Emit a loop to initialize stack cells for locals when optimizing for
       // size. Otherwise, unroll the loop for maximum performance.
       __ LoadRoot(t5, Heap::kUndefinedValueRootIndex);
-      if (FLAG_optimize_for_size && locals_count > 4) {
+      if ((FLAG_optimize_for_size && locals_count > 4) ||
+          !is_int16(locals_count)) {
         Label loop;
-        __ li(a2, Operand(locals_count));
+        __ Subu(a2, sp, Operand(locals_count * kPointerSize));
         __ bind(&loop);
-        __ Subu(a2, a2, 1);
-        __ push(t5);
-        __ Branch(&loop, gt, a2, Operand(zero_reg));
+        __ Subu(sp, sp, Operand(kPointerSize));
+        __ Branch(&loop, gt, sp, Operand(a2), USE_DELAY_SLOT);
+        __ sw(t5, MemOperand(sp, 0));  // Push in the delay slot.
       } else {
+        __ Subu(sp, sp, Operand(locals_count * kPointerSize));
         for (int i = 0; i < locals_count; i++) {
-          __ push(t5);
+          __ sw(t5, MemOperand(sp, i * kPointerSize));
         }
       }
     }
   }
 
   bool function_in_register = true;
 
   // Possibly allocate a local context.
   int heap_slots = info->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
   if (heap_slots > 0) {
@@ skipping 4762 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS