| 1 | /* s_ceilf.c -- float version of s_ceil.c. |
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| 2 | */ |
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| 3 | |
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| 4 | /* |
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| 5 | * ==================================================== |
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| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 7 | * |
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| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 9 | * Permission to use, copy, modify, and distribute this |
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| 10 | * software is freely granted, provided that this notice |
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| 11 | * is preserved. |
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| 12 | * ==================================================== |
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| 13 | */ |
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| 14 | |
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| 15 | #define NO_MATH_REDIRECT |
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| 16 | #include <math.h> |
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| 17 | #include <math_private.h> |
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| 18 | #include <libm-alias-float.h> |
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| 19 | #include <math-use-builtins.h> |
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| 20 | |
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| 21 | float |
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| 22 | __ceilf (float x) |
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| 23 | { |
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| 24 | #if USE_CEILF_BUILTIN |
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| 25 | return __builtin_ceilf (x); |
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| 26 | #else |
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| 27 | /* Use generic implementation. */ |
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| 28 | int32_t i0, j0; |
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| 29 | uint32_t i; |
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| 30 | |
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| 31 | GET_FLOAT_WORD (i0, x); |
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| 32 | j0 = ((i0 >> 23) & 0xff) - 0x7f; |
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| 33 | if (j0 < 23) |
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| 34 | { |
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| 35 | if (j0 < 0) |
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| 36 | { |
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| 37 | /* return 0 * sign (x) if |x| < 1 */ |
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| 38 | if (i0 < 0) |
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| 39 | i0 = 0x80000000; |
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| 40 | else if (i0 != 0) |
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| 41 | i0 = 0x3f800000; |
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| 42 | } |
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| 43 | else |
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| 44 | { |
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| 45 | i = (0x007fffff) >> j0; |
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| 46 | if ((i0 & i) == 0) |
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| 47 | return x; /* x is integral */ |
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| 48 | if (i0 > 0) |
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| 49 | i0 += (0x00800000) >> j0; |
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| 50 | i0 &= (~i); |
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| 51 | } |
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| 52 | } |
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| 53 | else |
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| 54 | { |
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| 55 | if (__glibc_unlikely (j0 == 0x80)) |
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| 56 | return x + x; /* inf or NaN */ |
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| 57 | else |
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| 58 | return x; /* x is integral */ |
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| 59 | } |
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| 60 | SET_FLOAT_WORD (x, i0); |
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| 61 | return x; |
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| 62 | #endif /* ! USE_CEILF_BUILTIN */ |
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| 63 | } |
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| 64 | #ifndef __ceilf |
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| 65 | libm_alias_float (__ceil, ceil) |
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| 66 | #endif |
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| 67 | |
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