2 * Copyright (C) 2012-2015 Free Software Foundation, Inc.
4 * This file is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 3, or (at your option) any
9 * This file is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * Under Section 7 of GPL version 3, you are granted additional
15 * permissions described in the GCC Runtime Library Exception, version
16 * 3.1, as published by the Free Software Foundation.
18 * You should have received a copy of the GNU General Public License and
19 * a copy of the GCC Runtime Library Exception along with this program;
20 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
21 * <http://www.gnu.org/licenses/>.
25 #include "sfp-machine.h"
29 unsigned short int __control_word;
30 unsigned short int __unused1;
31 unsigned short int __status_word;
32 unsigned short int __unused2;
33 unsigned short int __tags;
34 unsigned short int __unused3;
36 unsigned short int __cs_selector;
37 unsigned int __opcode:11;
38 unsigned int __unused4:5;
39 unsigned int __data_offset;
40 unsigned short int __data_selector;
41 unsigned short int __unused5;
45 __sfp_handle_exceptions (int _fex)
47 if (_fex & FP_EX_INVALID)
51 volatile float r __attribute__ ((unused));
52 asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
53 r = f; /* Needed to trigger exception. */
55 asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
56 /* No need for fwait, exception is triggered by emitted fstp. */
59 if (_fex & FP_EX_DENORM)
62 asm volatile ("fnstenv\t%0" : "=m" (temp));
63 temp.__status_word |= FP_EX_DENORM;
64 asm volatile ("fldenv\t%0" : : "m" (temp));
65 asm volatile ("fwait");
67 if (_fex & FP_EX_DIVZERO)
69 float f = 1.0f, g = 0.0f;
71 volatile float r __attribute__ ((unused));
72 asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
73 r = f; /* Needed to trigger exception. */
75 asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
76 /* No need for fwait, exception is triggered by emitted fstp. */
79 if (_fex & FP_EX_OVERFLOW)
82 asm volatile ("fnstenv\t%0" : "=m" (temp));
83 temp.__status_word |= FP_EX_OVERFLOW;
84 asm volatile ("fldenv\t%0" : : "m" (temp));
85 asm volatile ("fwait");
87 if (_fex & FP_EX_UNDERFLOW)
90 asm volatile ("fnstenv\t%0" : "=m" (temp));
91 temp.__status_word |= FP_EX_UNDERFLOW;
92 asm volatile ("fldenv\t%0" : : "m" (temp));
93 asm volatile ("fwait");
95 if (_fex & FP_EX_INEXACT)
97 float f = 1.0f, g = 3.0f;
99 volatile float r __attribute__ ((unused));
100 asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
101 r = f; /* Needed to trigger exception. */
103 asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
104 /* No need for fwait, exception is triggered by emitted fstp. */