about summary refs log tree commit diff
path: root/sysdeps/powerpc/powerpc32/fpu/s_rint.S
blob: f04055f4612f56f68959063ea6c6e06c4ece8b7b (plain) (blame)
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
/* Round to int floating-point values.  PowerPC32 version.
   Copyright (C) 2004-2013 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, 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>

	.section	.rodata.cst4,"aM",@progbits,4
	.align	2
.LC0:	/* 2**52 */
	.long 0x59800000

	.section	".text"
ENTRY (__rint)
#ifdef SHARED
	mflr	r11
	cfi_register(lr,r11)
	SETUP_GOT_ACCESS(r9,got_label)
	addis	r9,r9,.LC0-got_label@ha
	lfs	fp13,.LC0-got_label@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)  */
	fcmpu	cr6,fp1,fp12	/* if (x > 0.0)  */
	bnllr	cr7
	bng	cr6,.L4
	fadd	fp1,fp1,fp13	/* x+= TWO52;  */
	fsub	fp1,fp1,fp13	/* x-= TWO52;  */
	fabs	fp1,fp1		/* if (x == 0.0)  */
	blr			/* x = 0.0; */
.L4:
	bnllr	cr6		/* if (x < 0.0)  */
	fsub	fp1,fp1,fp13	/* x-= TWO52;  */
	fadd	fp1,fp1,fp13	/* x+= TWO52;  */
	fnabs	fp1,fp1		/* if (x == 0.0)  */
	blr			/* x = -0.0; */
	END (__rint)

weak_alias (__rint, rint)

#ifdef NO_LONG_DOUBLE
weak_alias (__rint, rintl)
strong_alias (__rint, __rintl)
#endif
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
compat_symbol (libm, __rint, rintl, GLIBC_2_0)
#endif