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
|
/* trunc function. PowerPC64 version.
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
.section ".toc","aw"
.LC0: /* 2**52 */
.tc FD_43300000_0[TC],0x4330000000000000
.LC2: /* -0.0 */
.tc FD_80000000_0[TC],0x8000000000000000
.section ".text"
/* double [fp1] trunc (double x [fp1])
IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer
value, in floating format, nearest to but no larger in magnitude
then the argument."
We set "round toward Zero" mode and trunc by adding +-2**52 then
subtracting +-2**52. */
ENTRY (__trunc)
CALL_MCOUNT 0
mffs fp11 /* Save current FPU rounding mode. */
lfd fp13,.LC0@toc(2)
fabs fp0,fp1
fsub fp12,fp13,fp13 /* generate 0.0 */
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */
fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
bnllr- cr7
mtfsfi 7,1 /* Set rounding toward 0 mode. */
ble- cr6,.L4
fadd fp1,fp1,fp13 /* x+= TWO52; */
fsub fp1,fp1,fp13 /* x-= TWO52; */
.L9:
mtfsf 0x01,fp11 /* restore previous truncing mode. */
blr
.L4:
bge- cr6,.L9 /* if (x < 0.0) */
fsub fp1,fp1,fp13 /* x-= TWO52; */
fadd fp1,fp1,fp13 /* x+= TWO52; */
fcmpu cr5,fp1,fp12 /* if (x > 0.0) */
mtfsf 0x01,fp11 /* restore previous rounding mode. */
bnelr+ cr5
lfd fp1,.LC2@toc(2) /* x must be -0.0 for the 0.0 case. */
blr
END (__trunc)
weak_alias (__trunc, trunc)
#ifdef NO_LONG_DOUBLE
weak_alias (__trunc, truncl)
strong_alias (__trunc, __truncl)
#endif
|
