1 | /* sf_ceil.c -- float version of s_ceil.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 huge = 1.0e30; |
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20 | #else |
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21 | static float huge = 1.0e30; |
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22 | #endif |
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23 | |
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24 | #ifdef __STDC__ |
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25 | float ceilf(float x) |
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26 | #else |
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27 | float ceilf(x) |
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28 | float x; |
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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,ix; |
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33 | GET_FLOAT_WORD(i0,x); |
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34 | ix = (i0&0x7fffffff); |
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35 | j0 = (ix>>23)-0x7f; |
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36 | if(j0<23) { |
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37 | if(j0<0) { /* raise inexact if x != 0 */ |
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38 | if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ |
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39 | if(i0<0) {i0=0x80000000;} |
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40 | else if(!FLT_UWORD_IS_ZERO(ix)) { i0=0x3f800000;} |
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41 | } |
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42 | } else { |
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43 | i = (0x007fffff)>>j0; |
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44 | if((i0&i)==0) return x; /* x is integral */ |
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45 | if(huge+x>(float)0.0) { /* raise inexact flag */ |
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46 | if(i0>0) i0 += (0x00800000)>>j0; |
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47 | i0 &= (~i); |
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48 | } |
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49 | } |
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50 | } else { |
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51 | if(!FLT_UWORD_IS_FINITE(ix)) return x+x; /* inf or NaN */ |
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52 | else return x; /* x is integral */ |
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53 | } |
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54 | SET_FLOAT_WORD(x,i0); |
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55 | return x; |
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56 | } |
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57 | |
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58 | #ifdef _DOUBLE_IS_32BITS |
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59 | |
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60 | #ifdef __STDC__ |
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61 | double ceil(double x) |
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62 | #else |
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63 | double ceil(x) |
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64 | double x; |
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65 | #endif |
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66 | { |
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67 | return (double) ceilf((float) x); |
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68 | } |
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69 | |
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70 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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