Migrate Math.Min/Max to CodeStubAssembler

src/builtins/s390/builtins-s390.cc

 // Copyright 2014 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_S390
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 99 matching lines @@
 
   __ LoadRR(r5, r3);
   // Run the native code for the Array function called as a normal function.
   // tail call a stub
   __ LoadRoot(r4, Heap::kUndefinedValueRootIndex);
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 // static
-void Builtins::Generate_MathMaxMin(MacroAssembler* masm, MathMaxMinKind kind) {
-  // ----------- S t a t e -------------
-  //  -- r2                     : number of arguments
-  //  -- r3                     : function
-  //  -- cp                     : context
-  //  -- lr                     : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero based)
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-  Condition const cond_done = (kind == MathMaxMinKind::kMin) ? lt : gt;
-  Heap::RootListIndex const root_index =
-      (kind == MathMaxMinKind::kMin) ? Heap::kInfinityValueRootIndex
-                                     : Heap::kMinusInfinityValueRootIndex;
-  DoubleRegister const reg = (kind == MathMaxMinKind::kMin) ? d2 : d1;
-
-  // Load the accumulator with the default return value (either -Infinity or
-  // +Infinity), with the tagged value in r7 and the double value in d1.
-  __ LoadRoot(r7, root_index);
-  __ LoadDouble(d1, FieldMemOperand(r7, HeapNumber::kValueOffset));
-
-  // Setup state for loop
-  // r4: address of arg[0] + kPointerSize
-  // r5: number of slots to drop at exit (arguments + receiver)
-  __ AddP(r6, r2, Operand(1));
-
-  Label done_loop, loop;
-  __ LoadRR(r6, r2);
-  __ bind(&loop);
-  {
-    // Check if all parameters done.
-    __ SubP(r6, Operand(1));
-    __ blt(&done_loop);
-
-    // Load the next parameter tagged value into r2.
-    __ ShiftLeftP(r1, r6, Operand(kPointerSizeLog2));
-    __ LoadP(r4, MemOperand(sp, r1));
-
-    // Load the double value of the parameter into d2, 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(r4, &convert_smi);
-    __ LoadP(r5, FieldMemOperand(r4, HeapObject::kMapOffset));
-    __ JumpIfRoot(r5, Heap::kHeapNumberMapRootIndex, &convert_number);
-    {
-      // Parameter is not a Number, use the ToNumber builtin to convert it.
-      DCHECK(!FLAG_enable_embedded_constant_pool);
-      FrameScope scope(masm, StackFrame::MANUAL);
-      __ SmiTag(r2);
-      __ SmiTag(r6);
-      __ EnterBuiltinFrame(cp, r3, r2);
-      __ Push(r6, r7);
-      __ LoadRR(r2, r4);
-      __ Call(masm->isolate()->builtins()->ToNumber(), RelocInfo::CODE_TARGET);
-      __ LoadRR(r4, r2);
-      __ Pop(r6, r7);
-      __ LeaveBuiltinFrame(cp, r3, r2);
-      __ SmiUntag(r6);
-      __ SmiUntag(r2);
-      {
-        // Restore the double accumulator value (d1).
-        Label done_restore;
-        __ SmiToDouble(d1, r7);
-        __ JumpIfSmi(r7, &done_restore);
-        __ LoadDouble(d1, FieldMemOperand(r7, HeapNumber::kValueOffset));
-        __ bind(&done_restore);
-      }
-    }
-    __ b(&convert);
-    __ bind(&convert_number);
-    __ LoadDouble(d2, FieldMemOperand(r4, HeapNumber::kValueOffset));
-    __ b(&done_convert);
-    __ bind(&convert_smi);
-    __ SmiToDouble(d2, r4);
-    __ bind(&done_convert);
-
-    // Perform the actual comparison with the accumulator value on the left hand
-    // side (d1) and the next parameter value on the right hand side (d2).
-    Label compare_nan, compare_swap;
-    __ cdbr(d1, d2);
-    __ bunordered(&compare_nan);
-    __ b(cond_done, &loop);
-    __ b(CommuteCondition(cond_done), &compare_swap);
-
-    // Left and right hand side are equal, check for -0 vs. +0.
-    __ TestDoubleIsMinusZero(reg, r1, r0);
-    __ bne(&loop);
-
-    // Update accumulator. Result is on the right hand side.
-    __ bind(&compare_swap);
-    __ ldr(d1, d2);
-    __ LoadRR(r7, r4);
-    __ b(&loop);
-
-    // At least one side is NaN, which means that the result will be NaN too.
-    // We still need to visit the rest of the arguments.
-    __ bind(&compare_nan);
-    __ LoadRoot(r7, Heap::kNanValueRootIndex);
-    __ LoadDouble(d1, FieldMemOperand(r7, HeapNumber::kValueOffset));
-    __ b(&loop);
-  }
-
-  __ bind(&done_loop);
-  // Drop all slots, including the receiver.
-  __ AddP(r2, Operand(1));
-  __ Drop(r2);
-  __ LoadRR(r2, r7);
-  __ Ret();
-}
-
-// static
 void Builtins::Generate_NumberConstructor(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r2                     : number of arguments
   //  -- r3                     : constructor function
   //  -- cp                     : context
   //  -- lr                     : return address
   //  -- sp[(argc - n - 1) * 4] : arg[n] (zero based)
   //  -- sp[argc * 4]           : receiver
   // -----------------------------------
 
@@ skipping 3008 matching lines @@
     __ bkpt(0);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390