Last change
on this file since 6328 was
6328,
checked in by aclsce, 17 months ago
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First import of oasis3-mct_5.0 (from oasis git server, branch OASIS3-MCT_5.0)
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File size:
985 bytes
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1 | /* |
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2 | * src/x86.c |
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3 | * |
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4 | * This work was supported by the Director, Office of Science, Division |
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5 | * of Mathematical, Information, and Computational Sciences of the |
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6 | * U.S. Department of Energy under contract number DE-AC03-76SF00098. |
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7 | * |
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8 | * Copyright (c) 2000-2001 |
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9 | * |
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10 | * Contains functions to set and restore the round-to-double flag in the |
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11 | * control word of a x86 FPU. |
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12 | */ |
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13 | |
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14 | #ifdef x86 |
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15 | #ifndef _FPU_GETCW |
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16 | #define _FPU_GETCW(x) asm volatile ("fnstcw %0":"=m" (x)); |
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17 | #endif |
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18 | |
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19 | #ifndef _FPU_SETCW |
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20 | #define _FPU_SETCW(x) asm volatile ("fldcw %0": :"m" (x)); |
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21 | #endif |
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22 | |
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23 | #ifndef _FPU_EXTENDED |
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24 | #define _FPU_EXTENDED 0x0300 |
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25 | #endif |
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26 | |
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27 | #ifndef _FPU_DOUBLE |
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28 | #define _FPU_DOUBLE 0x0200 |
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29 | #endif |
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30 | #endif /* x86 */ |
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31 | |
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32 | void shr_reprosumx86_fix_start(unsigned short *old_cw) { |
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33 | #ifdef x86 |
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34 | unsigned short new_cw; |
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35 | |
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36 | _FPU_GETCW(*old_cw); |
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37 | new_cw = (*old_cw & ~_FPU_EXTENDED) | _FPU_DOUBLE; |
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38 | _FPU_SETCW(new_cw); |
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39 | #endif |
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40 | } |
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41 | |
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42 | void shr_reprosumx86_fix_end(unsigned short *old_cw) { |
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43 | #ifdef x86 |
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44 | _FPU_SETCW(*old_cw); |
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45 | #endif |
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46 | } |
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47 | |
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