| /* Implement frexp for m68k. |
| Copyright (C) 1996-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| |
| FLOAT |
| M_DECL_FUNC (__frexp) (FLOAT value, int *expptr) |
| { |
| FLOAT mantissa, exponent; |
| int iexponent; |
| unsigned long fpsr; |
| |
| __asm ("ftst%.x %1\n" |
| "fmove%.l %/fpsr, %0" |
| : "=dm" (fpsr) : "f" (value)); |
| if (fpsr & (7 << 24)) |
| { |
| /* Not finite or zero. */ |
| *expptr = 0; |
| return value; |
| } |
| __asm ("fgetexp%.x %1, %0" : "=f" (exponent) : "f" (value)); |
| iexponent = (int) exponent + 1; |
| *expptr = iexponent; |
| __asm ("fscale%.l %2, %0" |
| : "=f" (mantissa) |
| : "0" (value), "dmi" (-iexponent)); |
| return mantissa; |
| } |
| declare_mgen_alias (__frexp, frexp) |
