X87: [builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/x87/code-generator-x87.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 352 matching lines @@
       } else {                                                        \
         if (instr->InputAt(1)->IsRegister()) {                        \
           __ asm_instr(i.InputRegister(0), i.InputRegister(1));       \
         } else {                                                      \
           __ asm_instr(i.InputRegister(0), i.InputOperand(1));        \
         }                                                             \
       }                                                               \
     }                                                                 \
   } while (0)
 
+#define ASSEMBLE_IEEE754_BINOP(name)                                          \
+  do {                                                                        \
+    /* Saves the esp into ebx */                                              \
+    __ push(ebx);                                                             \
+    __ mov(ebx, esp);                                                         \
+    /* Pass one double as argument on the stack. */                           \
+    __ PrepareCallCFunction(4, eax);                                          \
+    __ fstp(0);                                                               \
+    /* Load first operand from original stack */                              \
+    __ fld_d(MemOperand(ebx, 4 + kDoubleSize));                               \
+    /* Put first operand into stack for function call */                      \
+    __ fstp_d(Operand(esp, 0 * kDoubleSize));                                 \
+    /* Load second operand from original stack */                             \
+    __ fld_d(MemOperand(ebx, 4));                                             \
+    /* Put second operand into stack for function call */                     \
+    __ fstp_d(Operand(esp, 1 * kDoubleSize));                                 \
+    __ CallCFunction(ExternalReference::ieee754_##name##_function(isolate()), \
+                     4);                                                      \
+    /* Restore the ebx */                                                     \
+    __ pop(ebx);                                                              \
+    /* Return value is in st(0) on x87. */                                    \
+    __ lea(esp, Operand(esp, 2 * kDoubleSize));                               \
+  } while (false)
+
 #define ASSEMBLE_IEEE754_UNOP(name)                                           \
   do {                                                                        \
     /* Saves the esp into ebx */                                              \
     __ push(ebx);                                                             \
     __ mov(ebx, esp);                                                         \
     /* Pass one double as argument on the stack. */                           \
     __ PrepareCallCFunction(2, eax);                                          \
     __ fstp(0);                                                               \
     /* Load operand from original stack */                                    \
     __ fld_d(MemOperand(ebx, 4));                                             \
@@ skipping 333 matching lines @@
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
       Register base;
       if (offset.from_stack_pointer()) {
         base = esp;
       } else {
         base = ebp;
       }
       __ lea(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 kX87Add:
       if (HasImmediateInput(instr, 1)) {
         __ add(i.InputOperand(0), i.InputImmediate(1));
       } else {
@@ skipping 1790 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8