MIPS: Refine '[stubs] Simplify the non-function case of CallConstructStub.'

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2653 matching lines @@
   {
     __ Branch(&non_function_call, ne, t1, Operand(JS_FUNCTION_PROXY_TYPE));
     // TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
     __ lw(a1, FieldMemOperand(a1, JSFunctionProxy::kConstructTrapOffset));
     __ Jump(isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
 
     __ bind(&non_function_call);
     {
       // Determine the delegate for the target (if any).
       FrameScope scope(masm, StackFrame::INTERNAL);
-      __ sll(a0, a0, kSmiTagSize);  // Smi tagged.
+      __ SmiTag(a0);
       __ Push(a0, a1);
       __ CallRuntime(Runtime::kGetConstructorDelegate, 1);
       __ mov(a1, v0);
       __ Pop(a0);
-      __ sra(a0, a0, kSmiTagSize);  // Un-tag.
+      __ SmiUntag(a0);
     }
     // The delegate is always a regular function.
     __ AssertFunction(a1);
     __ Jump(masm->isolate()->builtins()->CallFunction(),
             RelocInfo::CODE_TARGET);
   }
 }
 
 
 static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
@@ skipping 3065 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS