1/* Copyright (C) 2004-2022 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library.  If not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#include "div_libc.h"
19
20/* 32-bit signed int remainder.  This is not a normal C function.  Argument
21   registers are t10 and t11, the result goes in t12.  Only t12 and AT may
22   be clobbered.
23
24   The FPU can handle the division for all input values except zero.
25   All we have to do is compute the remainder via multiply-and-subtract.
26
27   The FPCR save/restore is due to the fact that the EV6 _will_ set FPCR_INE
28   for cvttq/c even without /sui being set.  It will not, however, properly
29   raise the exception, so we don't have to worry about FPCR_INED being clear
30   and so dying by SIGFPE.  */
31
32#ifndef EXTEND
33#define EXTEND(S,D)	sextl S, D
34#endif
35
36	.text
37	.align	4
38	.globl	__reml
39	.type	__reml, @funcnoplt
40	.usepv	__reml, no
41
42	cfi_startproc
43	cfi_return_column (RA)
44__reml:
45	lda	sp, -FRAME(sp)
46	cfi_def_cfa_offset (FRAME)
47	CALL_MCOUNT
48	stt	$f0, 0(sp)
49	excb
50	beq	Y, DIVBYZERO
51
52	stt	$f1, 8(sp)
53	stt	$f2, 16(sp)
54	cfi_rel_offset ($f0, 0)
55	cfi_rel_offset ($f1, 8)
56	cfi_rel_offset ($f2, 16)
57	mf_fpcr	$f2
58
59	EXTEND	(X, RV)
60	EXTEND	(Y, AT)
61	_ITOFT2	RV, $f0, 24, AT, $f1, 32
62	cvtqt	$f0, $f0
63	cvtqt	$f1, $f1
64	divt/c	$f0, $f1, $f0
65	cvttq/c	$f0, $f0
66	excb
67	mt_fpcr	$f2
68	_FTOIT	$f0, RV, 24
69
70	ldt	$f0, 0(sp)
71	mull	RV, Y, RV
72	ldt	$f1, 8(sp)
73	ldt	$f2, 16(sp)
74	lda	sp, FRAME(sp)
75	cfi_restore ($f0)
76	cfi_restore ($f1)
77	cfi_restore ($f2)
78	cfi_def_cfa_offset (0)
79	subl	X, RV, RV
80	ret	$31, (RA), 1
81
82	cfi_endproc
83	.size	__reml, .-__reml
84
85	DO_DIVBYZERO
86