| 1 | /* s_ceill.c -- long double 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 | #if defined (LIBM_SCCS) && ! defined (lint) |
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| 16 | static char rcsid[] = "$NetBSD: $" ; |
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| 17 | #endif |
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| 18 | |
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| 19 | /* |
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| 20 | * ceill(x) |
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| 21 | * Return x rounded toward -inf to integral value |
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| 22 | * Method: |
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| 23 | * Bit twiddling. |
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| 24 | */ |
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| 25 | |
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| 26 | #define NO_MATH_REDIRECT |
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| 27 | #include <math.h> |
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| 28 | #include <math_private.h> |
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| 29 | #include <libm-alias-ldouble.h> |
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| 30 | #include <math-use-builtins.h> |
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| 31 | |
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| 32 | _Float128 |
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| 33 | __ceill (_Float128 x) |
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| 34 | { |
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| 35 | #if USE_CEILL_BUILTIN |
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| 36 | return __builtin_ceill (x); |
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| 37 | #else |
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| 38 | /* Use generic implementation. */ |
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| 39 | int64_t i0, i1, j0; |
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| 40 | uint64_t i, j; |
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| 41 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
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| 42 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
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| 43 | if (j0 < 48) |
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| 44 | { |
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| 45 | if (j0 < 0) |
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| 46 | { |
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| 47 | /* return 0 * sign (x) if |x| < 1 */ |
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| 48 | if (i0 < 0) |
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| 49 | { |
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| 50 | i0 = 0x8000000000000000ULL; |
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| 51 | i1 = 0; |
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| 52 | } |
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| 53 | else if ((i0 | i1) != 0) |
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| 54 | { |
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| 55 | i0 = 0x3fff000000000000ULL; |
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| 56 | i1 = 0; |
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| 57 | } |
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| 58 | } |
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| 59 | else |
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| 60 | { |
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| 61 | i = (0x0000ffffffffffffULL) >> j0; |
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| 62 | if (((i0 & i) | i1) == 0) |
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| 63 | return x; /* x is integral */ |
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| 64 | if (i0 > 0) |
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| 65 | i0 += (0x0001000000000000LL) >> j0; |
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| 66 | i0 &= (~i); |
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| 67 | i1 = 0; |
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| 68 | } |
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| 69 | } |
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| 70 | else if (j0 > 111) |
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| 71 | { |
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| 72 | if (j0 == 0x4000) |
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| 73 | return x + x; /* inf or NaN */ |
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| 74 | else |
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| 75 | return x; /* x is integral */ |
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| 76 | } |
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| 77 | else |
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| 78 | { |
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| 79 | i = -1ULL >> (j0 - 48); |
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| 80 | if ((i1 & i) == 0) |
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| 81 | return x; /* x is integral */ |
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| 82 | if (i0 > 0) |
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| 83 | { |
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| 84 | if (j0 == 48) |
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| 85 | i0 += 1; |
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| 86 | else |
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| 87 | { |
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| 88 | j = i1 + (1LL << (112 - j0)); |
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| 89 | if (j < i1) |
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| 90 | i0 += 1; /* got a carry */ |
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| 91 | i1 = j; |
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| 92 | } |
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| 93 | } |
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| 94 | i1 &= (~i); |
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| 95 | } |
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| 96 | SET_LDOUBLE_WORDS64 (x, i0, i1); |
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| 97 | return x; |
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| 98 | #endif /* ! USE_CEILL_BUILTIN */ |
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| 99 | } |
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| 100 | libm_alias_ldouble (__ceil, ceil) |
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| 101 | |
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