1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* Round to int floating-point values. PowerPC32 version.
Copyright (C) 2011-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* This has been coded in assembler because GCC makes such a mess of it
when it's coded in C. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
#include <libm-alias-double.h>
/* double [fp1] nearbyint(double [fp1] x) */
.section .rodata.cst4,"aM",@progbits,4
.align 2
.LC0: /* 2**52 */
.long 0x59800000 /* TWO52: 2**52 */
.section ".text"
ENTRY (__nearbyint)
#ifdef SHARED
mflr r11
cfi_register(lr,r11)
bcl 20,31,1f
1: mflr r9
addis r9,r9,.LC0-1b@ha
lfs fp13,.LC0-1b@l(r9)
mtlr r11
cfi_same_value (lr)
#else
lis r9,.LC0@ha
lfs fp13,.LC0@l(r9)
#endif
fabs fp0,fp1
fsub fp12,fp13,fp13 /* generate 0.0 */
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52 */
bge cr7,.L10
fcmpu cr7,fp1,fp12 /* if (x > 0.0 */
ble cr7,L(lessthanzero)
mffs fp11
mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */
fadd fp1,fp1,fp13 /* x += TWO52 */
fsub fp1,fp1,fp13 /* x -= TWO52 */
fabs fp1,fp1 /* if (x == 0.0 */
mtfsf 0xff,fp11 /* Restore FE_INEXACT state. */
blr
L(lessthanzero):
bgelr cr7
mffs fp11
mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */
fsub fp1,fp1,fp13 /* x -= TWO52 */
fadd fp1,fp1,fp13 /* x += TWO52 */
fnabs fp1,fp1 /* if (x == 0.0) */
mtfsf 0xff,fp11 /* Restore FE_INEXACT state. */
blr
.L10:
/* Ensure sNaN input is converted to qNaN. */
fcmpu cr7,fp1,fp1
beqlr cr7
fadd fp1,fp1,fp1
blr
END (__nearbyint)
libm_alias_double (__nearbyint, nearbyint)
|
