diff options
Diffstat (limited to 'sysdeps/m68k/m680x0/fpu/s_frexp_template.c')
-rw-r--r-- | sysdeps/m68k/m680x0/fpu/s_frexp_template.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/m68k/m680x0/fpu/s_frexp_template.c b/sysdeps/m68k/m680x0/fpu/s_frexp_template.c new file mode 100644 index 0000000000..7f50887373 --- /dev/null +++ b/sysdeps/m68k/m680x0/fpu/s_frexp_template.c @@ -0,0 +1,45 @@ +/* Implement frexp for m68k. + Copyright (C) 1996-2017 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) |