MIPS: [builtins] Fix MathMaxMin.

src/mips64/builtins-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/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 109 matching lines @@
   __ mov(a3, a1);
   __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 
 // static
 void Builtins::Generate_MathMaxMin(MacroAssembler* masm, MathMaxMinKind kind) {
   // ----------- S t a t e -------------
-  //  -- a0                 : number of arguments
-  //  -- a1                 : function
-  //  -- cp                 : context
-  //  -- ra                 : return address
-  //  -- sp[(argc - n) * 8] : arg[n] (zero-based)
-  //  -- sp[(argc + 1) * 8] : receiver
+  //  -- a0                     : number of arguments
+  //  -- a1                     : function
+  //  -- cp                     : context
+  //  -- ra                     : return address
+  //  -- sp[(argc - n - 1) * 8] : arg[n] (zero-based)
+  //  -- sp[argc * 8]           : receiver
   // -----------------------------------
   Heap::RootListIndex const root_index =
       (kind == MathMaxMinKind::kMin) ? Heap::kInfinityValueRootIndex
                                      : Heap::kMinusInfinityValueRootIndex;
 
   // Load the accumulator with the default return value (either -Infinity or
   // +Infinity), with the tagged value in t1 and the double value in f0.
   __ LoadRoot(t1, root_index);
   __ ldc1(f0, FieldMemOperand(t1, HeapNumber::kValueOffset));
-  __ Addu(a3, a0, 1);
 
   Label done_loop, loop;
+  __ mov(a3, a0);
   __ bind(&loop);
   {
     // Check if all parameters done.
-    __ Dsubu(a0, a0, Operand(1));
-    __ Branch(&done_loop, lt, a0, Operand(zero_reg));
+    __ Dsubu(a3, a3, Operand(1));
+    __ Branch(&done_loop, lt, a3, Operand(zero_reg));
 
     // Load the next parameter tagged value into a2.
-    __ Dlsa(at, sp, a0, kPointerSizeLog2);
+    __ Dlsa(at, sp, a3, kPointerSizeLog2);
     __ ld(a2, MemOperand(at));
 
     // Load the double value of the parameter into f2, maybe converting the
     // parameter to a number first using the ToNumber builtin if necessary.
     Label convert, convert_smi, convert_number, done_convert;
     __ bind(&convert);
     __ JumpIfSmi(a2, &convert_smi);
     __ ld(a4, FieldMemOperand(a2, HeapObject::kMapOffset));
     __ JumpIfRoot(a4, Heap::kHeapNumberMapRootIndex, &convert_number);
     {
@@ skipping 51 matching lines @@
     __ jmp(&loop);
 
     // At least one side is NaN, which means that the result will be NaN too.
     __ bind(&compare_nan);
     __ LoadRoot(t1, Heap::kNanValueRootIndex);
     __ ldc1(f0, FieldMemOperand(t1, HeapNumber::kValueOffset));
     __ jmp(&loop);
   }
 
   __ bind(&done_loop);
-  __ Dlsa(sp, sp, a3, kPointerSizeLog2);
+  // Drop all slots, including the receiver.
+  __ Daddu(a0, a0, Operand(1));
+  __ Dlsa(sp, sp, a0, kPointerSizeLog2);
   __ Ret(USE_DELAY_SLOT);
   __ mov(v0, t1);  // In delay slot.
 }
 
 // static
 void Builtins::Generate_NumberConstructor(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- a0                     : number of arguments
   //  -- a1                     : constructor function
   //  -- ra                     : return address
@@ skipping 2758 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64