| 1 | /* s_rintf.c -- float version of s_rint.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 | __rintf (float x) |
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| 23 | { |
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| 24 | #if USE_RINTF_BUILTIN |
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| 25 | return __builtin_rintf (x); |
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| 26 | #else |
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| 27 | /* Use generic implementation. */ |
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| 28 | static const float |
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| 29 | TWO23[2] = { |
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| 30 | 8.3886080000e+06, /* 0x4b000000 */ |
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| 31 | -8.3886080000e+06, /* 0xcb000000 */ |
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| 32 | }; |
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| 33 | int32_t i0, j0, sx; |
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| 34 | float w, t; |
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| 35 | GET_FLOAT_WORD (i0, x); |
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| 36 | sx = (i0 >> 31) & 1; |
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| 37 | j0 = ((i0 >> 23) & 0xff) - 0x7f; |
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| 38 | if (j0 < 23) |
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| 39 | { |
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| 40 | if(j0 < 0) |
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| 41 | { |
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| 42 | w = TWO23[sx] + x; |
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| 43 | t = w - TWO23[sx]; |
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| 44 | GET_FLOAT_WORD (i0, t); |
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| 45 | SET_FLOAT_WORD (t, (i0 & 0x7fffffff) | (sx << 31)); |
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| 46 | return t; |
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| 47 | } |
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| 48 | } |
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| 49 | else |
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| 50 | { |
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| 51 | if (j0 == 0x80) |
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| 52 | return x + x; /* inf or NaN */ |
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| 53 | else |
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| 54 | return x; /* x is integral */ |
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| 55 | } |
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| 56 | w = TWO23[sx] + x; |
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| 57 | return w - TWO23[sx]; |
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| 58 | #endif /* ! USE_RINTF_BUILTIN */ |
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| 59 | } |
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| 60 | #ifndef __rintf |
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| 61 | libm_alias_float (__rint, rint) |
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| 62 | #endif |
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| 63 | |
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