Rev 4872 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * ==================================================== |
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| 3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 4 | * |
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| 5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 6 | * Permission to use, copy, modify, and distribute this |
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| 7 | * software is freely granted, provided that this notice |
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| 8 | * is preserved. |
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| 9 | * ==================================================== |
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| 10 | */ |
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| 11 | |||
| 12 | #include "fdlibm.h" |
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| 13 | |||
| 14 | #ifdef __STDC__ |
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| 15 | long int lroundf(float x) |
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| 16 | #else |
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| 17 | long int lroundf(x) |
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| 18 | float x; |
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| 19 | #endif |
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| 20 | { |
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| 21 | __int32_t exponent_less_127; |
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| 22 | __uint32_t w; |
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| 23 | long int result; |
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| 24 | __int32_t sign; |
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| 25 | |||
| 26 | GET_FLOAT_WORD (w, x); |
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| 27 | exponent_less_127 = ((w & 0x7f800000) >> 23) - 127; |
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| 28 | sign = (w & 0x80000000) != 0 ? -1 : 1; |
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| 29 | w &= 0x7fffff; |
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| 30 | w |= 0x800000; |
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| 31 | |||
| 32 | if (exponent_less_127 < (int)((8 * sizeof (long int)) - 1)) |
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| 33 | { |
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| 34 | if (exponent_less_127 < 0) |
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| 35 | return exponent_less_127 < -1 ? 0 : sign; |
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| 36 | else if (exponent_less_127 >= 23) |
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| 37 | result = (long int) w << (exponent_less_127 - 23); |
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| 38 | else |
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| 39 | { |
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| 40 | w += 0x400000 >> exponent_less_127; |
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| 41 | result = w >> (23 - exponent_less_127); |
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| 42 | } |
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| 43 | } |
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| 44 | else |
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| 45 | return (long int) x; |
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| 46 | |||
| 47 | return sign * result; |
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| 48 | } |
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| 49 | |||
| 50 | #ifdef _DOUBLE_IS_32BITS |
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| 51 | |||
| 52 | #ifdef __STDC__ |
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| 53 | long int lround(double x) |
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| 54 | #else |
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| 55 | long int lround(x) |
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| 56 | double x; |
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| 57 | #endif |
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| 58 | { |
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| 59 | return lroundf((float) x); |
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| 60 | } |
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| 61 | |||
| 62 | #endif /* defined(_DOUBLE_IS_32BITS) */ |