The Tor Browser: comparison mfbt/double-conversion/diy-fp.h

--1:000000000000
+:3ad33db49749
+// 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.
+#ifndef DOUBLE_CONVERSION_DIY_FP_H_
+#define DOUBLE_CONVERSION_DIY_FP_H_
+#include "utils.h"
+namespace double_conversion {
+// This "Do It Yourself Floating Point" class implements a floating-point number
+// with a uint64 significand and an int exponent. Normalized DiyFp numbers will
+// have the most significant bit of the significand set.
+// Multiplication and Subtraction do not normalize their results.
+// DiyFp are not designed to contain special doubles (NaN and Infinity).
+class DiyFp {
+public:
+static const int kSignificandSize = 64;
+DiyFp() : f_(0), e_(0) {}
+DiyFp(uint64_t f, int e) : f_(f), e_(e) {}
+// this = this - other.
+// The exponents of both numbers must be the same and the significand of this
+// must be bigger than the significand of other.
+// The result will not be normalized.
+void Subtract(const DiyFp& other) {
+ASSERT(e_ == other.e_);
+ASSERT(f_ >= other.f_);
+f_ -= other.f_;
+}
+// Returns a - b.
+// The exponents of both numbers must be the same and this must be bigger
+// than other. The result will not be normalized.
+static DiyFp Minus(const DiyFp& a, const DiyFp& b) {
+DiyFp result = a;
+result.Subtract(b);
+return result;
+}
+// this = this * other.
+void Multiply(const DiyFp& other);
+// returns a * b;
+static DiyFp Times(const DiyFp& a, const DiyFp& b) {
+DiyFp result = a;
+result.Multiply(b);
+return result;
+}
+void Normalize() {
+ASSERT(f_ != 0);
+uint64_t f = f_;
+int e = e_;
+// This method is mainly called for normalizing boundaries. In general
+// boundaries need to be shifted by 10 bits. We thus optimize for this case.
+const uint64_t k10MSBits = UINT64_2PART_C(0xFFC00000, 00000000);
+while ((f & k10MSBits) == 0) {
+f <<= 10;
+e -= 10;
+}
+while ((f & kUint64MSB) == 0) {
+f <<= 1;
+e--;
+}
+f_ = f;
+e_ = e;
+}
+static DiyFp Normalize(const DiyFp& a) {
+DiyFp result = a;
+result.Normalize();
+return result;
+}
+uint64_t f() const { return f_; }
+int e() const { return e_; }
+void set_f(uint64_t new_value) { f_ = new_value; }
+void set_e(int new_value) { e_ = new_value; }
+private:
+static const uint64_t kUint64MSB = UINT64_2PART_C(0x80000000, 00000000);
+uint64_t f_;
+int e_;
+};
+}  // namespace double_conversion
+#endif  // DOUBLE_CONVERSION_DIY_FP_H_

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comparison: mfbt/double-conversion/diy-fp.h

mfbt/double-conversion/diy-fp.h