1 /* lround function. PowerPC32 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
22 .section .rodata.cst8,"aM",@progbits,8
31 /* long [r3] lround (float x [fp1])
32 IEEE 1003.1 lround function. IEEE specifies "round to the nearest
33 integer value, rounding halfway cases away from zero, regardless of
34 the current rounding mode." However PowerPC Architecture defines
35 "round to Nearest" as "Choose the best approximation. In case of a
36 tie, choose the one that is even (least significant bit o).".
37 So we can't use the PowerPC "round to Nearest" mode. Instead we set
38 "round toward Zero" mode and round by adding +-0.5 before rounding
39 to the integer value. */
44 # ifdef HAVE_ASM_PPC_REL16
47 addis r9,r9,.LC0-1b@ha
50 bl _GLOBAL_OFFSET_TABLE_@local-4
61 lfs fp10,.LC1-.LC0(r9)
66 fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
68 fadd fp1,fp1,fp10 /* x+= 0.5; */
70 fctiwz fp2,fp1 /* Convert To Integer DW lround toward 0. */
72 nop /* Ensure the following load is in a different dispatch */
73 nop /* group to avoid pipe stall on POWER4&5. */
78 fsub fp1,fp1,fp10 /* x-= 0.5; */
82 strong_alias (__lround, __lround)
83 weak_alias (__lround, lround)
85 strong_alias (__lround, __lroundf)
86 weak_alias (__lround, lroundf)
89 weak_alias (__lround, lroundl)
90 strong_alias (__lround, __lroundl)