1 | /* sf_modf.c -- float version of s_modf.c. |
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2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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3 | */ |
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4 | |
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5 | /* |
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6 | * ==================================================== |
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7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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8 | * |
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9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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10 | * Permission to use, copy, modify, and distribute this |
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11 | * software is freely granted, provided that this notice |
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12 | * is preserved. |
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13 | * ==================================================== |
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14 | */ |
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15 | |
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16 | #include "fdlibm.h" |
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17 | |
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18 | #ifdef __STDC__ |
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19 | static const float one = 1.0; |
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20 | #else |
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21 | static float one = 1.0; |
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22 | #endif |
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23 | |
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24 | #ifdef __STDC__ |
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25 | float modff(float x, float *iptr) |
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26 | #else |
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27 | float modff(x, iptr) |
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28 | float x,*iptr; |
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29 | #endif |
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30 | { |
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31 | __int32_t i0,j0; |
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32 | __uint32_t i; |
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33 | GET_FLOAT_WORD(i0,x); |
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34 | j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ |
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35 | if(j0<23) { /* integer part in x */ |
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36 | if(j0<0) { /* |x|<1 */ |
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37 | SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ |
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38 | return x; |
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39 | } else { |
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40 | i = (0x007fffff)>>j0; |
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41 | if((i0&i)==0) { /* x is integral */ |
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42 | __uint32_t ix; |
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43 | *iptr = x; |
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44 | GET_FLOAT_WORD(ix,x); |
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45 | SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ |
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46 | return x; |
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47 | } else { |
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48 | SET_FLOAT_WORD(*iptr,i0&(~i)); |
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49 | return x - *iptr; |
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50 | } |
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51 | } |
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52 | } else { /* no fraction part */ |
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53 | __uint32_t ix; |
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54 | *iptr = x*one; |
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55 | GET_FLOAT_WORD(ix,x); |
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56 | SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ |
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57 | return x; |
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58 | } |
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59 | } |
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60 | |
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61 | #ifdef _DOUBLE_IS_32BITS |
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62 | |
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63 | #ifdef __STDC__ |
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64 | double modf(double x, double *iptr) |
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65 | #else |
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66 | double modf(x, iptr) |
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67 | double x,*iptr; |
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68 | #endif |
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69 | { |
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70 | return (double) modff((float) x, (float *) iptr); |
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71 | } |
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72 | |
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73 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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