1 /* truncf function. PowerPC64 version.
2 Copyright (C) 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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
24 .tc FD_41600000_0[TC],0x4160000000000000
26 .tc FD_80000000_0[TC],0x8000000000000000
29 /* float [fp1] truncf (float x [fp1])
30 IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer
31 value, in floating format, nearest to but no larger in magnitude
33 We set "round toward Zero" mode and trunc by adding +-2**23 then
34 subtracting +-2**23. */
38 mffs fp11 /* Save current FPU rounding mode. */
41 fsubs fp12,fp13,fp13 /* generate 0.0 */
42 fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */
43 fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
45 mtfsfi 7,1 /* Set rounding toward 0 mode. */
47 fadds fp1,fp1,fp13 /* x+= TWO23; */
48 fsubs fp1,fp1,fp13 /* x-= TWO23; */
50 mtfsf 0x01,fp11 /* restore previous truncing mode. */
53 bge- cr6,.L9 /* if (x < 0.0) */
54 fsubs fp1,fp1,fp13 /* x-= TWO23; */
55 fadds fp1,fp1,fp13 /* x+= TWO23; */
56 fcmpu cr5,fp1,fp12 /* if (x > 0.0) */
57 mtfsf 0x01,fp11 /* restore previous rounding mode. */
59 lfd fp1,.LC2@toc(2) /* x must be -0.0 for the 0.0 case. */
63 weak_alias (__truncf, truncf)