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annotate gcc/config/mips/crtfastmath.c @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
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children
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68
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Copyright (C) 2010 Free Software Foundation, Inc.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 This file is part of GCC.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 GCC is free software; you can redistribute it and/or modify it
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 under the terms of the GNU General Public License as published by
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 the Free Software Foundation; either version 3, or (at your option)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 any later version.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 GCC is distributed in the hope that it will be useful, but WITHOUT
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 License for more details.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 Under Section 7 of GPL version 3, you are granted additional
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 permissions described in the GCC Runtime Library Exception, version
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 3.1, as published by the Free Software Foundation.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 You should have received a copy of the GNU General Public License
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 and a copy of the GCC Runtime Library Exception along with this
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 program; see the files COPYING3 and COPYING.RUNTIME respectively.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 If not, see <http://www.gnu.org/licenses/>. */
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23
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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24 #ifdef __mips_hard_float
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25
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 /* Flush denormalized numbers to zero. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 #define _FPU_FLUSH_TZ 0x1000000
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28
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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29 /* Rounding control. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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30 #define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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31 #define _FPU_RC_ZERO 0x1
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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32 #define _FPU_RC_UP 0x2
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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33 #define _FPU_RC_DOWN 0x3
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34
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35 /* Enable interrupts for IEEE exceptions. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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36 #define _FPU_IEEE 0x00000F80
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37
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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38 /* Macros for accessing the hardware control word. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39 #define _FPU_GETCW(cw) __asm__ ("cfc1 %0,$31" : "=r" (cw))
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40 #define _FPU_SETCW(cw) __asm__ ("ctc1 %0,$31" : : "r" (cw))
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41
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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42 static void __attribute__((constructor))
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 set_fast_math (void)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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45 unsigned int fcr;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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46
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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47 /* Flush to zero, round to nearest, IEEE exceptions disabled. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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48 fcr = _FPU_FLUSH_TZ | _FPU_RC_NEAREST;
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49
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50 _FPU_SETCW(fcr);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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51 }
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52
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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53 #endif /* __mips_hard_float */