X87: [turbofan] Introduce Float64Pow and NumberPow 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 767 matching lines @@
       break;
     case kIeee754Float64Log1p:
       ASSEMBLE_IEEE754_UNOP(log1p);
       break;
     case kIeee754Float64Log2:
       ASSEMBLE_IEEE754_UNOP(log2);
       break;
     case kIeee754Float64Log10:
       ASSEMBLE_IEEE754_UNOP(log10);
       break;
+    case kIeee754Float64Pow: {
+      // Keep the x87 FPU stack empty before calling stub code
+      __ fstp(0);
+      // Call the MathStub and put return value in stX_0
+      MathPowStub stub(isolate(), MathPowStub::DOUBLE);
+      __ CallStub(&stub);
+      /* Return value is in st(0) on x87. */
+      __ lea(esp, Operand(esp, 2 * kDoubleSize));
+      break;
+    }
     case kIeee754Float64Sin:
       __ X87SetFPUCW(0x027F);
       ASSEMBLE_IEEE754_UNOP(sin);
       __ X87SetFPUCW(0x037F);
       break;
     case kIeee754Float64Tan:
       __ X87SetFPUCW(0x027F);
       ASSEMBLE_IEEE754_UNOP(tan);
       __ X87SetFPUCW(0x037F);
       break;
@@ skipping 1818 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8