Migrate Math.Min/Max to CodeStubAssembler

src/builtins/x64/builtins-x64.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_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/counters.h"
 #include "src/deoptimizer.h"
@@ skipping 1666 matching lines @@
 
   __ movp(rdx, rdi);
   // Run the native code for the Array function called as a normal function.
   // tail call a stub
   __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 // static
-void Builtins::Generate_MathMaxMin(MacroAssembler* masm, MathMaxMinKind kind) {
-  // ----------- S t a t e -------------
-  //  -- rax                 : number of arguments
-  //  -- rdi                 : function
-  //  -- rsi                 : context
-  //  -- rsp[0]              : return address
-  //  -- rsp[(argc - n) * 8] : arg[n] (zero-based)
-  //  -- rsp[(argc + 1) * 8] : receiver
-  // -----------------------------------
-  Condition const cc = (kind == MathMaxMinKind::kMin) ? below : above;
-  Heap::RootListIndex const root_index =
-      (kind == MathMaxMinKind::kMin) ? Heap::kInfinityValueRootIndex
-                                     : Heap::kMinusInfinityValueRootIndex;
-  XMMRegister const reg = (kind == MathMaxMinKind::kMin) ? xmm1 : xmm0;
-
-  // Load the accumulator with the default return value (either -Infinity or
-  // +Infinity), with the tagged value in rdx and the double value in xmm0.
-  __ LoadRoot(rdx, root_index);
-  __ Movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
-  __ Move(rcx, rax);
-
-  Label done_loop, loop;
-  __ bind(&loop);
-  {
-    // Check if all parameters done.
-    __ testp(rcx, rcx);
-    __ j(zero, &done_loop);
-
-    // Load the next parameter tagged value into rbx.
-    __ movp(rbx, Operand(rsp, rcx, times_pointer_size, 0));
-
-    // Load the double value of the parameter into xmm1, 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(rbx, &convert_smi);
-    __ JumpIfRoot(FieldOperand(rbx, HeapObject::kMapOffset),
-                  Heap::kHeapNumberMapRootIndex, &convert_number);
-    {
-      // Parameter is not a Number, use the ToNumber builtin to convert it.
-      FrameScope scope(masm, StackFrame::MANUAL);
-      __ Integer32ToSmi(rax, rax);
-      __ Integer32ToSmi(rcx, rcx);
-      __ EnterBuiltinFrame(rsi, rdi, rax);
-      __ Push(rcx);
-      __ Push(rdx);
-      __ movp(rax, rbx);
-      __ Call(masm->isolate()->builtins()->ToNumber(), RelocInfo::CODE_TARGET);
-      __ movp(rbx, rax);
-      __ Pop(rdx);
-      __ Pop(rcx);
-      __ LeaveBuiltinFrame(rsi, rdi, rax);
-      __ SmiToInteger32(rcx, rcx);
-      __ SmiToInteger32(rax, rax);
-      {
-        // Restore the double accumulator value (xmm0).
-        Label restore_smi, done_restore;
-        __ JumpIfSmi(rdx, &restore_smi, Label::kNear);
-        __ Movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
-        __ jmp(&done_restore, Label::kNear);
-        __ bind(&restore_smi);
-        __ SmiToDouble(xmm0, rdx);
-        __ bind(&done_restore);
-      }
-    }
-    __ jmp(&convert);
-    __ bind(&convert_number);
-    __ Movsd(xmm1, FieldOperand(rbx, HeapNumber::kValueOffset));
-    __ jmp(&done_convert, Label::kNear);
-    __ bind(&convert_smi);
-    __ SmiToDouble(xmm1, rbx);
-    __ bind(&done_convert);
-
-    // Perform the actual comparison with the accumulator value on the left hand
-    // side (xmm0) and the next parameter value on the right hand side (xmm1).
-    Label compare_equal, compare_nan, compare_swap, done_compare;
-    __ Ucomisd(xmm0, xmm1);
-    __ j(parity_even, &compare_nan, Label::kNear);
-    __ j(cc, &done_compare, Label::kNear);
-    __ j(equal, &compare_equal, Label::kNear);
-
-    // Result is on the right hand side.
-    __ bind(&compare_swap);
-    __ Movaps(xmm0, xmm1);
-    __ Move(rdx, rbx);
-    __ jmp(&done_compare, Label::kNear);
-
-    // At least one side is NaN, which means that the result will be NaN too.
-    __ bind(&compare_nan);
-    __ LoadRoot(rdx, Heap::kNanValueRootIndex);
-    __ Movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
-    __ jmp(&done_compare, Label::kNear);
-
-    // Left and right hand side are equal, check for -0 vs. +0.
-    __ bind(&compare_equal);
-    __ Movmskpd(kScratchRegister, reg);
-    __ testl(kScratchRegister, Immediate(1));
-    __ j(not_zero, &compare_swap);
-
-    __ bind(&done_compare);
-    __ decp(rcx);
-    __ jmp(&loop);
-  }
-
-  __ bind(&done_loop);
-  __ PopReturnAddressTo(rcx);
-  __ leap(rsp, Operand(rsp, rax, times_pointer_size, kPointerSize));
-  __ PushReturnAddressFrom(rcx);
-  __ movp(rax, rdx);
-  __ Ret();
-}
-
-// static
 void Builtins::Generate_NumberConstructor(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax                 : number of arguments
   //  -- rdi                 : constructor function
   //  -- rsi                 : context
   //  -- rsp[0]              : return address
   //  -- rsp[(argc - n) * 8] : arg[n] (zero-based)
   //  -- rsp[(argc + 1) * 8] : receiver
   // -----------------------------------
 
@@ skipping 1487 matching lines @@
 void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
   Generate_OnStackReplacementHelper(masm, true);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64