1/*
  2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License version 2 as
  6 * published by the Free Software Foundation.
  7 */
  8
  9#include <linux/linkage.h>
 10
 11#ifdef __LITTLE_ENDIAN__
 12#define WORD2 r2
 13#define SHIFT r3
 14#else /* BIG ENDIAN */
 15#define WORD2 r3
 16#define SHIFT r2
 17#endif
 18
 19ENTRY(memcmp)
 20	or	r12,r0,r1
 21	asl_s	r12,r12,30
 22	sub	r3,r2,1
 23	brls	r2,r12,.Lbytewise
 24	ld	r4,[r0,0]
 25	ld	r5,[r1,0]
 26	lsr.f	lp_count,r3,3
 27	lpne	.Loop_end
 28	ld_s	WORD2,[r0,4]
 29	ld_s	r12,[r1,4]
 30	brne	r4,r5,.Leven
 31	ld.a	r4,[r0,8]
 32	ld.a	r5,[r1,8]
 33	brne	WORD2,r12,.Lodd
 34.Loop_end:
 35	asl_s	SHIFT,SHIFT,3
 36	bhs_s	.Last_cmp
 37	brne	r4,r5,.Leven
 38	ld	r4,[r0,4]
 39	ld	r5,[r1,4]
 40#ifdef __LITTLE_ENDIAN__
 41	nop_s
 42	; one more load latency cycle
 43.Last_cmp:
 44	xor	r0,r4,r5
 45	bset	r0,r0,SHIFT
 46	sub_s	r1,r0,1
 47	bic_s	r1,r1,r0
 48	norm	r1,r1
 49	b.d	.Leven_cmp
 50	and	r1,r1,24
 51.Leven:
 52	xor	r0,r4,r5
 53	sub_s	r1,r0,1
 54	bic_s	r1,r1,r0
 55	norm	r1,r1
 56	; slow track insn
 57	and	r1,r1,24
 58.Leven_cmp:
 59	asl	r2,r4,r1
 60	asl	r12,r5,r1
 61	lsr_s	r2,r2,1
 62	lsr_s	r12,r12,1
 63	j_s.d	[blink]
 64	sub	r0,r2,r12
 65	.balign	4
 66.Lodd:
 67	xor	r0,WORD2,r12
 68	sub_s	r1,r0,1
 69	bic_s	r1,r1,r0
 70	norm	r1,r1
 71	; slow track insn
 72	and	r1,r1,24
 73	asl_s	r2,r2,r1
 74	asl_s	r12,r12,r1
 75	lsr_s	r2,r2,1
 76	lsr_s	r12,r12,1
 77	j_s.d	[blink]
 78	sub	r0,r2,r12
 79#else /* BIG ENDIAN */
 80.Last_cmp:
 81	neg_s	SHIFT,SHIFT
 82	lsr	r4,r4,SHIFT
 83	lsr	r5,r5,SHIFT
 84	; slow track insn
 85.Leven:
 86	sub.f	r0,r4,r5
 87	mov.ne	r0,1
 88	j_s.d	[blink]
 89	bset.cs	r0,r0,31
 90.Lodd:
 91	cmp_s	WORD2,r12
 92
 93	mov_s	r0,1
 94	j_s.d	[blink]
 95	bset.cs	r0,r0,31
 96#endif /* ENDIAN */
 97	.balign	4
 98.Lbytewise:
 99	breq	r2,0,.Lnil
100	ldb	r4,[r0,0]
101	ldb	r5,[r1,0]
102	lsr.f	lp_count,r3
103	lpne	.Lbyte_end
104	ldb_s	r3,[r0,1]
105	ldb	r12,[r1,1]
106	brne	r4,r5,.Lbyte_even
107	ldb.a	r4,[r0,2]
108	ldb.a	r5,[r1,2]
109	brne	r3,r12,.Lbyte_odd
110.Lbyte_end:
111	bcc	.Lbyte_even
112	brne	r4,r5,.Lbyte_even
113	ldb_s	r3,[r0,1]
114	ldb_s	r12,[r1,1]
115.Lbyte_odd:
116	j_s.d	[blink]
117	sub	r0,r3,r12
118.Lbyte_even:
119	j_s.d	[blink]
120	sub	r0,r4,r5
121.Lnil:
122	j_s.d	[blink]
123	mov	r0,0
124END(memcmp)