1 /* llround function. PowerPC32 on PowerPC64 version.
2 Copyright (C) 2004, 2006 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., 1 Franklin Street, Fifth Floor, Boston MA
21 #include <math_ldbl_opt.h>
23 .section .rodata.cst8,"aM",@progbits,8
32 /* long [r3] lround (float x [fp1])
33 IEEE 1003.1 lround function. IEEE specifies "round to the nearest
34 integer value, rounding halfway cases away from zero, regardless of
35 the current rounding mode." However PowerPC Architecture defines
36 "round to Nearest" as "Choose the best approximation. In case of a
37 tie, choose the one that is even (least significant bit o).".
38 So we can't use the PowerPC "round to Nearest" mode. Instead we set
39 "round toward Zero" mode and round by adding +-0.5 before rounding
40 to the integer value. */
44 cfi_adjust_cfa_offset (16)
48 # ifdef HAVE_ASM_PPC_REL16
51 addis r9,r9,.LC0-1b@ha
54 bl _GLOBAL_OFFSET_TABLE_@local-4
61 lfs fp10,.LC1-.LC0(r9)
68 fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
70 fadd fp1,fp1,fp10 /* x+= 0.5; */
72 fctidz fp2,fp1 /* Convert To Integer DW round toward 0. */
74 nop /* Ensure the following load is in a different dispatch */
75 nop /* group to avoid pipe stall on POWER4&5. */
82 fsub fp1,fp1,fp10 /* x-= 0.5; */
86 weak_alias (__llround, llround)
88 strong_alias (__llround, __llroundf)
89 weak_alias (__llround, llroundf)
92 weak_alias (__llround, llroundl)
93 strong_alias (__llround, __llroundl)
95 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
96 compat_symbol (libm, __llround, llroundl, GLIBC_2_1)