1 /* Copyright (C) 1997, 1999 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include "math_private.h"
28 #define float_type double
31 #define CONCATX(a,b) __CONCAT(a,b)
32 #define s(name) CONCATX(name,SUFF)
33 #define m81(func) __m81_u(s(func))
36 s(__ieee754_scalb) (float_type x, float_type fn)
39 unsigned long x_cond = __m81_test (x);
40 unsigned long fn_cond = __m81_test (fn);
42 if ((x_cond | fn_cond) & __M81_COND_NAN)
45 if (fn_cond & __M81_COND_INF)
47 if (!(fn_cond & __M81_COND_NEG))
49 else if (x_cond & __M81_COND_ZERO)
55 if (m81(__rint) (fn) != fn)
56 return (x - x) / (x - x);
58 __asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x));