1/* Round float to int floating-point values without generating
2   an inexact exception, sparc64 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 <libm-alias-double.h>
23
24	/* We pop constants into the FPU registers using the incoming
25	   argument stack slots, since this avoid having to use any PIC
26	   references.  We also thus avoid having to allocate a register
27	   window.
28
29	   VIS instructions are used to facilitate the formation of
30	   easier constants, and the propagation of the sign bit.  */
31
32#define TWO_FIFTYTWO	0x43300000		/* 2**52 */
33
34#define ZERO		%f10			/* 0.0 */
35#define SIGN_BIT	%f12			/* -0.0 */
36
37ENTRY (__nearbyint)
38	fcmpd	%fcc3, %f0, %f0			/* Check for sNaN */
39	stx	%fsr, [%sp + STACK_BIAS + 144]
40	sethi	%hi(TWO_FIFTYTWO), %o2
41	sllx	%o2, 32, %o2
42	ldx	[%sp + STACK_BIAS + 144], %o4
43	sethi	%hi(0xf8003e0), %o5
44	fzero	ZERO
45	or	%o5, %lo(0xf8003e0), %o5
46	fnegd	ZERO, SIGN_BIT
47	andn	%o4, %o5, %o4
48	stx	%o2, [%sp + STACK_BIAS + 128]
49	stx	%o4, [%sp + STACK_BIAS + 136]
50	ldx	[%sp + STACK_BIAS + 136], %fsr
51	fabsd	%f0, %f14
52	ldd	[%sp + STACK_BIAS + 128], %f16
53	fcmpd	%fcc3, %f14, %f16
54	fmovduge %fcc3, ZERO, %f16
55	fand	%f0, SIGN_BIT, SIGN_BIT
56	for	%f16, SIGN_BIT, %f16
57	faddd	%f0, %f16, %f6
58	fsubd	%f6, %f16, %f0
59	fabsd	%f0, %f0
60	for	%f0, SIGN_BIT, %f0
61	retl
62	 ldx	[%sp + STACK_BIAS + 144], %fsr
63END (__nearbyint)
64libm_alias_double (__nearbyint, nearbyint)
65