1 /* llroundf 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_00000000_0[TC],0x0000000000000000
26 .tc FD_3fe00000_0[TC],0x3fe0000000000000
29 /* long long [r3] llroundf (float x [fp1])
30 IEEE 1003.1 llroundf function. IEEE specifies "roundf to the nearest
31 integer value, roundfing halfway cases away from zero, regardless of
32 the current roundfing mode." However PowerPC Architecture defines
33 "roundf to Nearest" as "Choose the best approximation. In case of a
34 tie, choose the one that is even (least significant bit o).".
35 So we can't use the PowerPC "round to Nearest" mode. Instead we set
36 "round toward Zero" mode and round by adding +-0.5 before rounding
37 to the integer value. */
43 fcmpu cr6,fp1,fp12 /* if (x < 0.0) */
44 fsubs fp3,fp1,fp10 /* x-= 0.5; */
46 fadds fp3,fp1,fp10 /* x+= 0.5; */
48 fctidz fp2,fp3 /* Convert To Integer DW round toward 0. */
50 nop /* Insure the following load is in a different dispatch group */
51 nop /* to avoid pipe stall on POWER4&5. */
57 strong_alias (__llroundf, __lroundf)
58 weak_alias (__llroundf, llroundf)
59 weak_alias (__lroundf, lroundf)