projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d614a753 | 1 | /* Copyright (C) 1997-2020 Free Software Foundation, Inc. |
| 79c6cc00 UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 3214b89b AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 79c6cc00 UD |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3214b89b | 13 | Lesser General Public License for more details. |
| 79c6cc00 | 14 | |
| 3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff | 16 | License along with the GNU C Library. If not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| 79c6cc00 | 18 | |
| 79c6cc00 | 19 | #include <math.h> |
| e038d690 | 20 | #include <math_private.h> |
| 5da9d124 | 21 | #include "mathimpl.h" |
| 79c6cc00 UD |
22 | |
| 23 | #ifndef SUFF | |
| 24 | #define SUFF | |
| 25 | #endif | |
| 26 | #ifndef float_type | |
| 27 | #define float_type double | |
| 28 | #endif | |
| 29 | ||
| 30 | #define CONCATX(a,b) __CONCAT(a,b) | |
| 31 | #define s(name) CONCATX(name,SUFF) | |
| 32 | #define m81(func) __m81_u(s(func)) | |
| 33 | ||
| 34 | float_type | |
| 35 | s(__ieee754_scalb) (float_type x, float_type fn) | |
| 36 | { | |
| 37 | float_type retval; | |
| 38 | unsigned long x_cond = __m81_test (x); | |
| 39 | unsigned long fn_cond = __m81_test (fn); | |
| 40 | ||
| 41 | if ((x_cond | fn_cond) & __M81_COND_NAN) | |
| 42 | return x * fn; | |
| 43 | ||
| 44 | if (fn_cond & __M81_COND_INF) | |
| 45 | { | |
| 46 | if (!(fn_cond & __M81_COND_NEG)) | |
| 47 | return x * fn; | |
| 48 | else if (x_cond & __M81_COND_ZERO) | |
| 49 | return x; | |
| 79c6cc00 UD |
50 | else |
| 51 | return x / -fn; | |
| 52 | } | |
| 53 | ||
| 54 | if (m81(__rint) (fn) != fn) | |
| 5d0b1535 | 55 | return (x - x) / (x - x); |
| 79c6cc00 UD |
56 | |
| 57 | __asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x)); | |
| 58 | return retval; | |
| 59 | } | |
| d3d9bde5 | 60 | strong_alias (s(__ieee754_scalb), CONCATX (s(__scalb), _finite)) |