[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/arm64/code-generator-arm64.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.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 494 matching lines @@
   } while (0)
 
 #define ASSEMBLE_ATOMIC_STORE_INTEGER(asm_instr)                      \
   do {                                                                \
     __ Dmb(InnerShareable, BarrierAll);                               \
     __ asm_instr(i.InputRegister(2),                                  \
                  MemOperand(i.InputRegister(0), i.InputRegister(1))); \
     __ Dmb(InnerShareable, BarrierAll);                               \
   } while (0)
 
+#define ASSEMBLE_IEEE754_BINOP(name)                                          \
+  do {                                                                        \
+    FrameScope scope(masm(), StackFrame::MANUAL);                             \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
+                     0, 2);                                                   \
+  } while (0)
+
 #define ASSEMBLE_IEEE754_UNOP(name)                                           \
   do {                                                                        \
     FrameScope scope(masm(), StackFrame::MANUAL);                             \
     __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
                      0, 1);                                                   \
   } while (0)
 
 void CodeGenerator::AssembleDeconstructFrame() {
   const CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
   if (descriptor->IsCFunctionCall() || descriptor->UseNativeStack()) {
@@ skipping 267 matching lines @@
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
       Register base;
       if (offset.from_stack_pointer()) {
         base = __ StackPointer();
       } else {
         base = fp;
       }
       __ Add(i.OutputRegister(0), base, Operand(offset.offset()));
       break;
     }
+    case kIeee754Float64Atan:
+      ASSEMBLE_IEEE754_UNOP(atan);
+      break;
+    case kIeee754Float64Atan2:
+      ASSEMBLE_IEEE754_BINOP(atan2);
+      break;
     case kIeee754Float64Log:
       ASSEMBLE_IEEE754_UNOP(log);
       break;
     case kIeee754Float64Log1p:
       ASSEMBLE_IEEE754_UNOP(log1p);
       break;
     case kArm64Float32RoundDown:
       __ Frintm(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArm64Float64RoundDown:
@@ skipping 1126 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8