Rev 4872 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* sf_ceil.c -- float version of s_ceil.c. |
| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
||
| 3 | */ |
||
| 4 | |||
| 5 | /* |
||
| 6 | * ==================================================== |
||
| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
||
| 8 | * |
||
| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
||
| 10 | * Permission to use, copy, modify, and distribute this |
||
| 11 | * software is freely granted, provided that this notice |
||
| 12 | * is preserved. |
||
| 13 | * ==================================================== |
||
| 14 | */ |
||
| 15 | |||
| 16 | #include "fdlibm.h" |
||
| 17 | |||
| 18 | #ifdef __STDC__ |
||
| 19 | static const float huge = 1.0e30; |
||
| 20 | #else |
||
| 21 | static float huge = 1.0e30; |
||
| 22 | #endif |
||
| 23 | |||
| 24 | #ifdef __STDC__ |
||
| 25 | float ceilf(float x) |
||
| 26 | #else |
||
| 27 | float ceilf(x) |
||
| 28 | float x; |
||
| 29 | #endif |
||
| 30 | { |
||
| 31 | __int32_t i0,j0; |
||
| 32 | __uint32_t i,ix; |
||
| 33 | GET_FLOAT_WORD(i0,x); |
||
| 34 | ix = (i0&0x7fffffff); |
||
| 35 | j0 = (ix>>23)-0x7f; |
||
| 36 | if(j0<23) { |
||
| 37 | if(j0<0) { /* raise inexact if x != 0 */ |
||
| 38 | if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ |
||
| 39 | if(i0<0) {i0=0x80000000;} |
||
| 40 | else if(!FLT_UWORD_IS_ZERO(ix)) { i0=0x3f800000;} |
||
| 41 | } |
||
| 42 | } else { |
||
| 43 | i = (0x007fffff)>>j0; |
||
| 44 | if((i0&i)==0) return x; /* x is integral */ |
||
| 45 | if(huge+x>(float)0.0) { /* raise inexact flag */ |
||
| 46 | if(i0>0) i0 += (0x00800000)>>j0; |
||
| 47 | i0 &= (~i); |
||
| 48 | } |
||
| 49 | } |
||
| 50 | } else { |
||
| 51 | if(!FLT_UWORD_IS_FINITE(ix)) return x+x; /* inf or NaN */ |
||
| 52 | else return x; /* x is integral */ |
||
| 53 | } |
||
| 54 | SET_FLOAT_WORD(x,i0); |
||
| 55 | return x; |
||
| 56 | } |
||
| 57 | |||
| 58 | #ifdef _DOUBLE_IS_32BITS |
||
| 59 | |||
| 60 | #ifdef __STDC__ |
||
| 61 | double ceil(double x) |
||
| 62 | #else |
||
| 63 | double ceil(x) |
||
| 64 | double x; |
||
| 65 | #endif |
||
| 66 | { |
||
| 67 | return (double) ceilf((float) x); |
||
| 68 | } |
||
| 69 | |||
| 70 | #endif /* defined(_DOUBLE_IS_32BITS) */ |