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b9b49b44 | 1 | /* Round a float value to a long long in the current rounding mode. |
d614a753 | 2 | Copyright (C) 1997-2020 Free Software Foundation, Inc. |
b9b49b44 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 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. | |
b9b49b44 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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
b9b49b44 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b9b49b44 | 18 | |
1ed0291c | 19 | #include <math.h> |
e8dab947 JM |
20 | #include <math_private.h> |
21 | #include <stdint.h> | |
216933b2 | 22 | #include <libm-alias-float.h> |
b9b49b44 UD |
23 | |
24 | long long int | |
25 | __llrintf (float x) | |
26 | { | |
2166283f AZ |
27 | #ifdef _ARCH_PWR4 |
28 | /* Assume powerpc64 instructions availability. */ | |
29 | long long int ret; | |
30 | __asm__ ("fctid %0, %1" : "=d" (ret) : "d" (x)); | |
31 | return ret; | |
32 | #else | |
f29b6f17 | 33 | float rx = rintf (x); |
e8dab947 JM |
34 | if (HAVE_PPC_FCTIDZ || rx != x) |
35 | return (long long int) rx; | |
36 | else | |
37 | { | |
38 | float arx = fabsf (rx); | |
39 | /* Avoid incorrect exceptions from libgcc conversions (as of GCC | |
40 | 5): <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59412>. */ | |
41 | if (arx < 0x1p31f) | |
42 | return (long long int) (long int) rx; | |
43 | else if (!(arx < 0x1p55f)) | |
44 | return (long long int) (long int) (rx * 0x1p-32f) << 32; | |
45 | uint32_t i0; | |
46 | GET_FLOAT_WORD (i0, rx); | |
47 | int exponent = ((i0 >> 23) & 0xff) - 0x7f; | |
48 | unsigned long long int mant = (i0 & 0x7fffff) | 0x800000; | |
49 | mant <<= exponent - 23; | |
50 | return (long long int) ((i0 & 0x80000000) != 0 ? -mant : mant); | |
51 | } | |
2166283f | 52 | #endif |
b9b49b44 | 53 | } |
216933b2 | 54 | libm_alias_float (__llrint, llrint) |