| 1 | /* Implement modf for m68k. |
|---|
| 2 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
|---|
| 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 |
|---|
| 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. |
|---|
| 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 |
|---|
| 13 | Lesser General Public License for more details. |
|---|
| 14 | |
|---|
| 15 | You should have received a copy of the GNU Lesser General Public |
|---|
| 16 | License along with the GNU C Library. If not, see |
|---|
| 17 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #include <math.h> |
|---|
| 20 | #include "mathimpl.h" |
|---|
| 21 | |
|---|
| 22 | FLOAT |
|---|
| 23 | M_DECL_FUNC (__modf) (FLOAT x, FLOAT *iptr) |
|---|
| 24 | { |
|---|
| 25 | FLOAT x_int, result; |
|---|
| 26 | unsigned long x_cond; |
|---|
| 27 | |
|---|
| 28 | __asm ("fintrz%.x %1, %0" : "=f" (x_int) : "f" (x)); |
|---|
| 29 | *iptr = x_int; |
|---|
| 30 | x_cond = __m81_test (val: x); |
|---|
| 31 | if (x_cond & __M81_COND_INF) |
|---|
| 32 | { |
|---|
| 33 | result = 0; |
|---|
| 34 | if (x_cond & __M81_COND_NEG) |
|---|
| 35 | result = -result; |
|---|
| 36 | } |
|---|
| 37 | else if (x_cond & __M81_COND_ZERO) |
|---|
| 38 | result = x; |
|---|
| 39 | else |
|---|
| 40 | result = x - x_int; |
|---|
| 41 | return result; |
|---|
| 42 | } |
|---|
| 43 | declare_mgen_alias (__modf, modf) |
|---|
| 44 | |
|---|
