Move files in wtf/ to platform/wtf/ (Part 9).

third_party/WebKit/Source/wtf/dtoa/diy-fp.cc

-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "diy-fp.h"
-
-#include "utils.h"
-
-namespace WTF {
-
-namespace double_conversion {
-
-    void DiyFp::Multiply(const DiyFp& other) {
-        // Simply "emulates" a 128 bit multiplication.
-        // However: the resulting number only contains 64 bits. The least
-        // significant 64 bits are only used for rounding the most significant 64
-        // bits.
-        const uint64_t kM32 = 0xFFFFFFFFU;
-        uint64_t a = f_ >> 32;
-        uint64_t b = f_ & kM32;
-        uint64_t c = other.f_ >> 32;
-        uint64_t d = other.f_ & kM32;
-        uint64_t ac = a * c;
-        uint64_t bc = b * c;
-        uint64_t ad = a * d;
-        uint64_t bd = b * d;
-        uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32);
-        // By adding 1U << 31 to tmp we round the final result.
-        // Halfway cases will be round up.
-        tmp += 1U << 31;
-        uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32);
-        e_ += other.e_ + 64;
-        f_ = result_f;
-    }
-
-}  // namespace double_conversion
-
-} // namespace WTF