[stubs] Simplify the ArrayConstructorStub.

src/mips64/code-stubs-mips64.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_MIPS64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1953 matching lines @@
 }
 
 void CallICStub::HandleArrayCase(MacroAssembler* masm, Label* miss) {
   // a1 - function
   // a3 - slot id
   // a2 - vector
   // a4 - allocation site (loaded from vector[slot])
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, at);
   __ Branch(miss, ne, a1, Operand(at));
 
-  __ li(a0, Operand(arg_count()));
-
   // Increment the call count for monomorphic function calls.
   IncrementCallCount(masm, a2, a3);
 
   __ mov(a2, a4);
   __ mov(a3, a1);
-  ArrayConstructorStub stub(masm->isolate(), arg_count());
+  __ li(a0, Operand(arg_count()));
+  ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 
 void CallICStub::Generate(MacroAssembler* masm) {
   // a1 - function
   // a3 - slot id (Smi)
   // a2 - vector
   Label extra_checks_or_miss, call, call_function, call_count_incremented;
   int argc = arg_count();
@@ skipping 1904 matching lines @@
     stubh1.GetCode();
     InternalArraySingleArgumentConstructorStub stubh2(isolate, kinds[i]);
     stubh2.GetCode();
   }
 }
 
 
 void ArrayConstructorStub::GenerateDispatchToArrayStub(
     MacroAssembler* masm,
     AllocationSiteOverrideMode mode) {
-  if (argument_count() == ANY) {
-    Label not_zero_case, not_one_case;
-    __ And(at, a0, a0);
-    __ Branch(&not_zero_case, ne, at, Operand(zero_reg));
-    CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
+  Label not_zero_case, not_one_case;
+  __ And(at, a0, a0);
+  __ Branch(&not_zero_case, ne, at, Operand(zero_reg));
+  CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
 
-    __ bind(&not_zero_case);
-    __ Branch(&not_one_case, gt, a0, Operand(1));
-    CreateArrayDispatchOneArgument(masm, mode);
+  __ bind(&not_zero_case);
+  __ Branch(&not_one_case, gt, a0, Operand(1));
+  CreateArrayDispatchOneArgument(masm, mode);
 
-    __ bind(&not_one_case);
-    ArrayNArgumentsConstructorStub stub(masm->isolate());
-    __ TailCallStub(&stub);
-  } else if (argument_count() == NONE) {
-    CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
-  } else if (argument_count() == ONE) {
-    CreateArrayDispatchOneArgument(masm, mode);
-  } else if (argument_count() == MORE_THAN_ONE) {
-    ArrayNArgumentsConstructorStub stub(masm->isolate());
-    __ TailCallStub(&stub);
-  } else {
-    UNREACHABLE();
-  }
+  __ bind(&not_one_case);
+  ArrayNArgumentsConstructorStub stub(masm->isolate());
+  __ TailCallStub(&stub);
 }
 
 
 void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- a0 : argc (only if argument_count() == ANY)
   //  -- a1 : constructor
   //  -- a2 : AllocationSite or undefined
   //  -- a3 : new target
   //  -- sp[0] : last argument
@@ skipping 32 matching lines @@
   __ SmiUntag(a3);
   STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
   __ And(a3, a3, Operand(AllocationSite::ElementsKindBits::kMask));
   GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
 
   __ bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
 
   // Subclassing.
   __ bind(&subclassing);
-  switch (argument_count()) {
-    case ANY:
-    case MORE_THAN_ONE:
-      __ Dlsa(at, sp, a0, kPointerSizeLog2);
-      __ sd(a1, MemOperand(at));
-      __ li(at, Operand(3));
-      __ Daddu(a0, a0, at);
-      break;
-    case NONE:
-      __ sd(a1, MemOperand(sp, 0 * kPointerSize));
-      __ li(a0, Operand(3));
-      break;
-    case ONE:
-      __ sd(a1, MemOperand(sp, 1 * kPointerSize));
-      __ li(a0, Operand(4));
-      break;
-  }
+  __ Dlsa(at, sp, a0, kPointerSizeLog2);
+  __ sd(a1, MemOperand(at));
+  __ li(at, Operand(3));
+  __ Daddu(a0, a0, at);
   __ Push(a3, a2);
   __ JumpToExternalReference(ExternalReference(Runtime::kNewArray, isolate()));
 }
 
 
 void InternalArrayConstructorStub::GenerateCase(
     MacroAssembler* masm, ElementsKind kind) {
 
   InternalArrayNoArgumentConstructorStub stub0(isolate(), kind);
   __ TailCallStub(&stub0, lo, a0, Operand(1));
@@ skipping 1119 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64