1/* Round float to int floating-point values without generating
2   an inexact exception, sparc32 v9 version.
3
4   Copyright (C) 2013-2022 Free Software Foundation, Inc.
5   This file is part of the GNU C Library.
6
7   The GNU C Library is free software; you can redistribute it and/or
8   modify it under the terms of the GNU Lesser General Public
9   License as published by the Free Software Foundation; either
10   version 2.1 of the License, or (at your option) any later version.
11
12   The GNU C Library is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15   Lesser General Public License for more details.
16
17   You should have received a copy of the GNU Lesser General Public
18   License along with the GNU C Library; if not, see
19   <https://www.gnu.org/licenses/>.  */
20
21#include <sysdep.h>
22#include <math_ldbl_opt.h>
23#include <libm-alias-double.h>
24
25	/* We pop constants into the FPU registers using the incoming
26	   argument stack slots, since this avoid having to use any PIC
27	   references.  We also thus avoid having to allocate a register
28	   window.
29
30	   VIS instructions are used to facilitate the formation of
31	   easier constants, and the propagation of the sign bit.  */
32
33#define TWO_FIFTYTWO	0x43300000		/* 2**52 */
34
35#define ZERO		%f10			/* 0.0 */
36#define SIGN_BIT	%f12			/* -0.0 */
37
38ENTRY (__nearbyint)
39	sllx	%o0, 32, %o0
40	or	%o0, %o1, %o0
41	stx	%o0, [%sp + 72]
42	ldd	[%sp + 72], %f0
43	fcmpd	%fcc3, %f0, %f0			/* Check for sNaN */
44	st	%fsr, [%sp + 88]
45	sethi	%hi(TWO_FIFTYTWO), %o2
46	sethi	%hi(0xf8003e0), %o5
47	ld	[%sp + 88], %o4
48	or	%o5, %lo(0xf8003e0), %o5
49	andn	%o4, %o5, %o4
50	fzero	ZERO
51	st	%o4, [%sp + 80]
52	sllx	%o2, 32, %o2
53	fnegd	ZERO, SIGN_BIT
54	ld	[%sp + 80], %fsr
55	stx	%o2, [%sp + 72]
56	fabsd	%f0, %f14
57	ldd	[%sp + 72], %f16
58	fcmpd	%fcc3, %f14, %f16
59	fmovduge %fcc3, ZERO, %f16
60	fand	%f0, SIGN_BIT, SIGN_BIT
61	for	%f16, SIGN_BIT, %f16
62	faddd	%f0, %f16, %f6
63	fsubd	%f6, %f16, %f0
64	fabsd	%f0, %f0
65	for	%f0, SIGN_BIT, %f0
66	retl
67	 ld	[%sp + 88], %fsr
68END (__nearbyint)
69libm_alias_double (__nearbyint, nearbyint)
70