| 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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