[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 576 matching lines @@
   do {                                                           \
     if (instr->InputAt(4)->IsRegister()) {                       \
       Register value = i.InputRegister(4);                       \
       ASSEMBLE_CHECKED_STORE_INTEGER_IMPL(asm_instr, Register);  \
     } else {                                                     \
       Immediate value = i.InputImmediate(4);                     \
       ASSEMBLE_CHECKED_STORE_INTEGER_IMPL(asm_instr, Immediate); \
     }                                                            \
   } while (false)
 
+#define ASSEMBLE_IEEE754_BINOP(name)                                          \
+  do {                                                                        \
+    __ PrepareCallCFunction(2);                                               \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
+                     2);                                                      \
+  } while (false)
+
 #define ASSEMBLE_IEEE754_UNOP(name)                                           \
   do {                                                                        \
     __ PrepareCallCFunction(1);                                               \
     __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
                      1);                                                      \
   } while (false)
 
 void CodeGenerator::AssembleDeconstructFrame() {
   __ movq(rsp, rbp);
   __ popq(rbp);
@@ skipping 233 matching lines @@
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
       Register base;
       if (offset.from_stack_pointer()) {
         base = rsp;
       } else {
         base = rbp;
       }
       __ leaq(i.OutputRegister(), Operand(base, 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 kX64Add32:
       ASSEMBLE_BINOP(addl);
       break;
     case kX64Add:
@@ skipping 1467 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8