Use fast_sqrt instead of std::sqrt in simulators.

src/mips64/simulator-mips64.cc

 // Copyright 2011 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 <limits.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/assembler.h"
 #include "src/base/bits.h"
+#include "src/codegen.h"
 #include "src/disasm.h"
 #include "src/mips64/constants-mips64.h"
 #include "src/mips64/simulator-mips64.h"
 #include "src/ostreams.h"
 
 // Only build the simulator if not compiling for real MIPS hardware.
 #if defined(USE_SIMULATOR)
 
 namespace v8 {
 namespace internal {
@@ skipping 2358 matching lines @@
             case ABS_D:
               set_fpu_register_double(fd_reg, fabs(fs));
               break;
             case MOV_D:
               set_fpu_register_double(fd_reg, fs);
               break;
             case NEG_D:
               set_fpu_register_double(fd_reg, -fs);
               break;
             case SQRT_D:
-              set_fpu_register_double(fd_reg, sqrt(fs));
+              set_fpu_register_double(fd_reg, fast_sqrt(fs));
               break;
             case C_UN_D:
               set_fcsr_bit(fcsr_cc, std::isnan(fs) || std::isnan(ft));
               break;
             case C_EQ_D:
               set_fcsr_bit(fcsr_cc, (fs == ft));
               break;
             case C_UEQ_D:
               set_fcsr_bit(fcsr_cc,
                            (fs == ft) || (std::isnan(fs) || std::isnan(ft)));
@@ skipping 1042 matching lines @@
 }
 
 
 #undef UNSUPPORTED
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_MIPS64