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comparison 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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67:f6334be47118 68:561a7518be6b
1 /* Copyright (C) 2010 Free Software Foundation, Inc.
2
3 This file is part of GCC.
4
5 GCC is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3, or (at your option)
8 any later version.
9
10 GCC is distributed in the hope that it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
13 License for more details.
14
15 Under Section 7 of GPL version 3, you are granted additional
16 permissions described in the GCC Runtime Library Exception, version
17 3.1, as published by the Free Software Foundation.
18
19 You should have received a copy of the GNU General Public License
20 and a copy of the GCC Runtime Library Exception along with this
21 program; see the files COPYING3 and COPYING.RUNTIME respectively.
22 If not, see <http://www.gnu.org/licenses/>. */
23
24 #ifdef __mips_hard_float
25
26 /* Flush denormalized numbers to zero. */
27 #define _FPU_FLUSH_TZ 0x1000000
28
29 /* Rounding control. */
30 #define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
31 #define _FPU_RC_ZERO 0x1
32 #define _FPU_RC_UP 0x2
33 #define _FPU_RC_DOWN 0x3
34
35 /* Enable interrupts for IEEE exceptions. */
36 #define _FPU_IEEE 0x00000F80
37
38 /* Macros for accessing the hardware control word. */
39 #define _FPU_GETCW(cw) __asm__ ("cfc1 %0,$31" : "=r" (cw))
40 #define _FPU_SETCW(cw) __asm__ ("ctc1 %0,$31" : : "r" (cw))
41
42 static void __attribute__((constructor))
43 set_fast_math (void)
44 {
45 unsigned int fcr;
46
47 /* Flush to zero, round to nearest, IEEE exceptions disabled. */
48 fcr = _FPU_FLUSH_TZ | _FPU_RC_NEAREST;
49
50 _FPU_SETCW(fcr);
51 }
52
53 #endif /* __mips_hard_float */