1/* Copyright (C) 2008-2021 Free Software Foundation, Inc.
2   Contributor: Joern Rennecke <joern.rennecke@embecosm.com>
3		on behalf of Synopsys Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24<http://www.gnu.org/licenses/>.  */
25
26#include "arc-ieee-754.h"
27/* inputs: DBL0, DBL1
28   output: z flag
29   clobber: r12, flags
30   For NaNs, bit 19.. bit 30 of the high word must be set.  */
31#if 0 /* DEBUG */
32	.global __eqdf2
33	.balign 4
34	FUNC(__eqdf2)
35__eqdf2:
36	st.a r11,[sp,-4]` push_s blink` st.a r10,[sp,-4]` st.a r9,[sp,-4]
37	st.a r8,[sp,-4]` st.a r7,[sp,-4]` st.a r6,[sp,-4]` st.a r5,[sp,-4]
38	st.a r4,[sp,-4]` push_s r3` push_s r2` push_s r1`
39	bl.d __eqdf2_c` push_s r0
40	mov r11,r0` pop_s r0` pop_s r1` pop_s r2` pop_s r3
41	ld.ab r4,[sp,4]` ld.ab r5,[sp,4]` ld.ab r6,[sp,4]`
42	ld.ab r7,[sp,4]` ld.ab r8,[sp,4]` ld.ab r9,[sp,4]
43	bl.d __eqdf2_asm` ld.ab r10,[sp,4]
44	pop_s blink
45	breq.d r11,0,0f
46	ld.ab r11,[sp,4]
47	jne_s [blink]
48	bl abort
490:	jeq_s [blink]
50	bl abort
51	ENDFUNC(__eqdf2)
52#define __eqdf2 __eqdf2_asm
53#endif /* DEBUG */
54	.global __eqdf2
55	.balign 4
56	HIDDEN_FUNC(__eqdf2)
57	/* Good performance as long as the difference in high word is
58	   well predictable (as seen from the branch predictor).  */
59__eqdf2:
60	brne.d DBL0H,DBL1H,.Lhighdiff
61#ifndef __HS__
62	/* The next two instructions are required to recognize the FPX
63	NaN, which has a pattern like this: 0x7ff0_0000_8000_0000, as
64	oposite to 0x7ff8_0000_0000_0000.  */
65	or.f    0,DBL0L,DBL1L
66	mov_s	r12,0x00200000
67	bset.ne r12,r12,0
68#else
69	bmsk    r12,DBL0H,20
70#endif /* __HS__ */
71	add1.f	r12,r12,DBL0H /* set c iff NaN; also, clear z if NaN.  */
72	j_s.d	[blink]
73	cmp.cc	DBL0L,DBL1L
74	.balign 4
75.Lhighdiff:
76	or	r12,DBL0H,DBL1H
77	or.f	0,DBL0L,DBL1L
78	j_s.d	[blink]
79	bmsk.eq.f r12,r12,30
80	ENDFUNC(__eqdf2)
81/* ??? could we do better by speeding up some 'common' case of inequality?  */
82