1 /* trunc function. PowerPC32 version.
2 Copyright (C) 2004-2018 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, see
17 <http://www.gnu.org/licenses/>. */
20 #include <math_ldbl_opt.h>
21 #include <libm-alias-double.h>
23 .section .rodata.cst4,"aM",@progbits,4
28 /* double [fp1] trunc (double x [fp1])
29 IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer
30 value, in floating format, nearest to but no larger in magnitude
32 We set "round toward Zero" mode and trunc by adding +-2**52 then
33 subtracting +-2**52. */
40 SETUP_GOT_ACCESS(r9,got_label)
41 addis r9,r9,.LC0-got_label@ha
42 lfs fp13,.LC0-got_label@l(r9)
50 fsub fp12,fp13,fp13 /* generate 0.0 */
51 fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */
52 mffs fp11 /* Save current FPU rounding mode and
54 fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
56 mtfsfi 7,1 /* Set rounding toward 0 mode. */
58 fadd fp1,fp1,fp13 /* x+= TWO52; */
59 fsub fp1,fp1,fp13 /* x-= TWO52; */
60 fabs fp1,fp1 /* if (x == 0.0) */
62 mtfsf 0xff,fp11 /* Restore previous rounding mode and
66 bge- cr6,.L9 /* if (x < 0.0) */
67 fsub fp1,fp1,fp13 /* x-= TWO52; */
68 fadd fp1,fp1,fp13 /* x+= TWO52; */
69 fnabs fp1,fp1 /* if (x == 0.0) */
72 mtfsf 0xff,fp11 /* Restore previous rounding mode and
76 /* Ensure sNaN input is converted to qNaN. */
83 libm_alias_double (__trunc, trunc)