/usr/lib/gcc-cross/powerpc64-linux-gnu/7/plugin/include/sreal.h is in gcc-7-plugin-dev-powerpc64-linux-gnu 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 | /* Definitions for simple data type for real numbers.
Copyright (C) 2002-2017 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_SREAL_H
#define GCC_SREAL_H
/* SREAL_PART_BITS has to be an even number. */
#define SREAL_PART_BITS 32
#define UINT64_BITS 64
#define SREAL_MIN_SIG ((int64_t) 1 << (SREAL_PART_BITS - 2))
#define SREAL_MAX_SIG (((int64_t) 1 << (SREAL_PART_BITS - 1)) - 1)
#define SREAL_MAX_EXP (INT_MAX / 4)
#define SREAL_BITS SREAL_PART_BITS
#define SREAL_SIGN(v) (v < 0 ? -1: 1)
#define SREAL_ABS(v) (v < 0 ? -v: v)
/* Structure for holding a simple real number. */
class sreal
{
public:
/* Construct an uninitialized sreal. */
sreal () : m_sig (-1), m_exp (-1) {}
/* Construct a sreal. */
sreal (int64_t sig, int exp = 0) : m_sig (sig), m_exp (exp)
{
normalize ();
}
void dump (FILE *) const;
int64_t to_int () const;
double to_double () const;
sreal operator+ (const sreal &other) const;
sreal operator- (const sreal &other) const;
sreal operator* (const sreal &other) const;
sreal operator/ (const sreal &other) const;
bool operator< (const sreal &other) const
{
if (m_exp == other.m_exp)
return m_sig < other.m_sig;
else
{
bool negative = m_sig < 0;
bool other_negative = other.m_sig < 0;
if (negative != other_negative)
return negative > other_negative;
bool r = m_exp < other.m_exp;
return negative ? !r : r;
}
}
bool operator== (const sreal &other) const
{
return m_exp == other.m_exp && m_sig == other.m_sig;
}
sreal operator- () const
{
sreal tmp = *this;
tmp.m_sig *= -1;
return tmp;
}
sreal shift (int s) const
{
/* Zero needs no shifting. */
if (!m_sig)
return *this;
gcc_checking_assert (s <= SREAL_MAX_EXP);
gcc_checking_assert (s >= -SREAL_MAX_EXP);
/* Overflows/drop to 0 could be handled gracefully, but hopefully we do not
need to do so. */
gcc_checking_assert (m_exp + s <= SREAL_MAX_EXP);
gcc_checking_assert (m_exp + s >= -SREAL_MAX_EXP);
sreal tmp = *this;
tmp.m_exp += s;
return tmp;
}
/* Global minimum sreal can hold. */
inline static sreal min ()
{
sreal min;
/* This never needs normalization. */
min.m_sig = -SREAL_MAX_SIG;
min.m_exp = SREAL_MAX_EXP;
return min;
}
/* Global minimum sreal can hold. */
inline static sreal max ()
{
sreal max;
/* This never needs normalization. */
max.m_sig = SREAL_MAX_SIG;
max.m_exp = SREAL_MAX_EXP;
return max;
}
private:
inline void normalize ();
inline void normalize_up ();
inline void normalize_down ();
void shift_right (int amount);
static sreal signedless_plus (const sreal &a, const sreal &b, bool negative);
static sreal signedless_minus (const sreal &a, const sreal &b, bool negative);
int64_t m_sig; /* Significant. */
signed int m_exp; /* Exponent. */
};
extern void debug (const sreal &ref);
extern void debug (const sreal *ptr);
inline sreal &operator+= (sreal &a, const sreal &b)
{
return a = a + b;
}
inline sreal &operator-= (sreal &a, const sreal &b)
{
return a = a - b;
}
inline sreal &operator/= (sreal &a, const sreal &b)
{
return a = a / b;
}
inline sreal &operator*= (sreal &a, const sreal &b)
{
return a = a * b;
}
inline bool operator!= (const sreal &a, const sreal &b)
{
return !(a == b);
}
inline bool operator> (const sreal &a, const sreal &b)
{
return !(a == b || a < b);
}
inline bool operator<= (const sreal &a, const sreal &b)
{
return a < b || a == b;
}
inline bool operator>= (const sreal &a, const sreal &b)
{
return a == b || a > b;
}
inline sreal operator<< (const sreal &a, int exp)
{
return a.shift (exp);
}
inline sreal operator>> (const sreal &a, int exp)
{
return a.shift (-exp);
}
/* Make significant to be >= SREAL_MIN_SIG.
Make this separate method so inliner can handle hot path better. */
inline void
sreal::normalize_up ()
{
unsigned HOST_WIDE_INT sig = absu_hwi (m_sig);
int shift = SREAL_PART_BITS - 2 - floor_log2 (sig);
gcc_checking_assert (shift > 0);
sig <<= shift;
m_exp -= shift;
gcc_checking_assert (sig <= SREAL_MAX_SIG && sig >= SREAL_MIN_SIG);
/* Check underflow. */
if (m_exp < -SREAL_MAX_EXP)
{
m_exp = -SREAL_MAX_EXP;
sig = 0;
}
if (SREAL_SIGN (m_sig) == -1)
m_sig = -sig;
else
m_sig = sig;
}
/* Make significant to be <= SREAL_MAX_SIG.
Make this separate method so inliner can handle hot path better. */
inline void
sreal::normalize_down ()
{
int last_bit;
unsigned HOST_WIDE_INT sig = absu_hwi (m_sig);
int shift = floor_log2 (sig) - SREAL_PART_BITS + 2;
gcc_checking_assert (shift > 0);
last_bit = (sig >> (shift-1)) & 1;
sig >>= shift;
m_exp += shift;
gcc_checking_assert (sig <= SREAL_MAX_SIG && sig >= SREAL_MIN_SIG);
/* Round the number. */
sig += last_bit;
if (sig > SREAL_MAX_SIG)
{
sig >>= 1;
m_exp++;
}
/* Check overflow. */
if (m_exp > SREAL_MAX_EXP)
{
m_exp = SREAL_MAX_EXP;
sig = SREAL_MAX_SIG;
}
if (SREAL_SIGN (m_sig) == -1)
m_sig = -sig;
else
m_sig = sig;
}
/* Normalize *this; the hot path. */
inline void
sreal::normalize ()
{
unsigned HOST_WIDE_INT sig = absu_hwi (m_sig);
if (sig == 0)
m_exp = -SREAL_MAX_EXP;
else if (sig > SREAL_MAX_SIG)
normalize_down ();
else if (sig < SREAL_MIN_SIG)
normalize_up ();
}
#endif
|