X87: [builtins] Introduce proper Float64Tan operator.

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 772 matching lines @@
       ASSEMBLE_IEEE754_UNOP(log2);
       break;
     case kIeee754Float64Log10:
       ASSEMBLE_IEEE754_UNOP(log10);
       break;
     case kIeee754Float64Sin:
       __ X87SetFPUCW(0x027F);
       ASSEMBLE_IEEE754_UNOP(sin);
       __ X87SetFPUCW(0x037F);
       break;
+    case kIeee754Float64Tan:
+      __ X87SetFPUCW(0x027F);
+      ASSEMBLE_IEEE754_UNOP(tan);
+      __ X87SetFPUCW(0x037F);
+      break;
     case kX87Add:
       if (HasImmediateInput(instr, 1)) {
         __ add(i.InputOperand(0), i.InputImmediate(1));
       } else {
         __ add(i.InputRegister(0), i.InputOperand(1));
       }
       break;
     case kX87And:
       if (HasImmediateInput(instr, 1)) {
         __ and_(i.InputOperand(0), i.InputImmediate(1));
@@ skipping 1808 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8