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1 /*
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2 * Copyright (C) 2001, 2009 Free Software Foundation, Inc.
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3 * Contributed by David S. Miller (davem@redhat.com)
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4 *
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5 * This file is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License as published by the
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7 * Free Software Foundation; either version 3, or (at your option) any
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8 * later version.
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9 *
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10 * This file is distributed in the hope that it will be useful, but
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * General Public License for more details.
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14 *
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15 * Under Section 7 of GPL version 3, you are granted additional
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16 * permissions described in the GCC Runtime Library Exception, version
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17 * 3.1, as published by the Free Software Foundation.
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18 *
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19 * You should have received a copy of the GNU General Public License and
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20 * a copy of the GCC Runtime Library Exception along with this program;
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21 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 * <http://www.gnu.org/licenses/>.
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23 */
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24
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25 #define FPRS_NS (1 << 22) /* Non-Standard fpu results */
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26
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27 static void __attribute__((constructor))
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28 set_fast_math (void)
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29 {
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30 unsigned int fsr;
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31
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32 /* This works for the 64-bit case because, even if 32-bit ld/st of
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33 the fsr register modified the upper 32-bit, the only thing up there
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34 are the 3 other condition codes which are "do not care" at the time
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35 that this runs. */
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36
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37 __asm__("st %%fsr, %0"
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38 : "=m" (fsr));
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39
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40 fsr |= FPRS_NS;
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41
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42 __asm__("ld %0, %%fsr"
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43 : : "m" (fsr));
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44 }
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