[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/mips/code-generator-mips.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/ast/scopes.h"
 #include "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 467 matching lines @@
     __ sync();                                           \
   } while (0)
 
 #define ASSEMBLE_ATOMIC_STORE_INTEGER(asm_instr)         \
   do {                                                   \
     __ sync();                                           \
     __ asm_instr(i.InputRegister(2), i.MemoryOperand()); \
     __ sync();                                           \
   } while (0)
 
+#define ASSEMBLE_IEEE754_BINOP(name)                                          \
+  do {                                                                        \
+    FrameScope scope(masm(), StackFrame::MANUAL);                             \
+    __ PrepareCallCFunction(0, 2, kScratchReg);                               \
+    __ MovToFloatParameters(i.InputDoubleRegister(0),                         \
+                            i.InputDoubleRegister(1));                        \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
+                     0, 2);                                                   \
+    /* Move the result in the double result register. */                      \
+    __ MovFromFloatResult(i.OutputDoubleRegister());                          \
+  } while (0)
+
 #define ASSEMBLE_IEEE754_UNOP(name)                                           \
   do {                                                                        \
     FrameScope scope(masm(), StackFrame::MANUAL);                             \
     __ PrepareCallCFunction(0, 1, kScratchReg);                               \
     __ MovToFloatParameter(i.InputDoubleRegister(0));                         \
     __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
                      0, 1);                                                   \
     /* Move the result in the double result register. */                      \
     __ MovFromFloatResult(i.OutputDoubleRegister());                          \
   } while (0)
@@ skipping 224 matching lines @@
       __ bind(ool->exit());
       break;
     }
     case kArchStackSlot: {
       FrameOffset offset =
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
       __ Addu(i.OutputRegister(), offset.from_stack_pointer() ? sp : fp,
               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 kMipsAdd:
       __ Addu(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
     case kMipsAddOvf:
@@ skipping 1272 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8