diff options
Diffstat (limited to 'sysdeps/m68k/fpu/e_scalb.c')
-rw-r--r-- | sysdeps/m68k/fpu/e_scalb.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/sysdeps/m68k/fpu/e_scalb.c b/sysdeps/m68k/fpu/e_scalb.c new file mode 100644 index 0000000..88edba1 --- /dev/null +++ b/sysdeps/m68k/fpu/e_scalb.c @@ -0,0 +1,60 @@ +/* Copyright (C) 1997, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <math.h> +#include "math_private.h" +#include "mathimpl.h" + +#ifndef SUFF +#define SUFF +#endif +#ifndef float_type +#define float_type double +#endif + +#define CONCATX(a,b) __CONCAT(a,b) +#define s(name) CONCATX(name,SUFF) +#define m81(func) __m81_u(s(func)) + +float_type +s(__ieee754_scalb) (float_type x, float_type fn) +{ + float_type retval; + unsigned long x_cond = __m81_test (x); + unsigned long fn_cond = __m81_test (fn); + + if ((x_cond | fn_cond) & __M81_COND_NAN) + return x * fn; + + if (fn_cond & __M81_COND_INF) + { + if (!(fn_cond & __M81_COND_NEG)) + return x * fn; + else if (x_cond & __M81_COND_ZERO) + return x; + else + return x / -fn; + } + + if (m81(__rint) (fn) != fn) + return (x - x) / (x - x); + + __asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x)); + return retval; +} |