about summary refs log tree commit diff
path: root/sysdeps/x86_64/multiarch/strcat-evex.S
blob: 110505cb139645f473670ff790852839d169c3e4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
/* strcat with 256-bit EVEX instructions.
   Copyright (C) 2021-2022 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#if IS_IN (libc)

# include <sysdep.h>

# ifndef STRCAT
#  define STRCAT  __strcat_evex
# endif

# define VMOVU		vmovdqu64
# define VMOVA		vmovdqa64

/* zero register */
# define XMMZERO	xmm16
# define YMMZERO	ymm16
# define YMM0		ymm17
# define YMM1		ymm18

# define USE_AS_STRCAT

/* Number of bytes in a vector register */
# define VEC_SIZE	32

	.section .text.evex,"ax",@progbits
ENTRY (STRCAT)
	mov	%rdi, %r9
# ifdef USE_AS_STRNCAT
	mov	%rdx, %r8
# endif

	xor	%eax, %eax
	mov	%edi, %ecx
	and	$((VEC_SIZE * 4) - 1), %ecx
	vpxorq	%XMMZERO, %XMMZERO, %XMMZERO
	cmp	$(VEC_SIZE * 3), %ecx
	ja	L(fourth_vector_boundary)
	vpcmpb	$0, (%rdi), %YMMZERO, %k0
	kmovd	%k0, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_first_vector)
	mov	%rdi, %rax
	and	$-VEC_SIZE, %rax
	jmp	L(align_vec_size_start)
L(fourth_vector_boundary):
	mov	%rdi, %rax
	and	$-VEC_SIZE, %rax
	vpcmpb	$0, (%rax), %YMMZERO, %k0
	mov	$-1, %r10d
	sub	%rax, %rcx
	shl	%cl, %r10d
	kmovd	%k0, %edx
	and	%r10d, %edx
	jnz	L(exit)

L(align_vec_size_start):
	vpcmpb	$0, VEC_SIZE(%rax), %YMMZERO, %k0
	kmovd	%k0, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_second_vector)

	vpcmpb	$0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
	kmovd	%k1, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_third_vector)

	vpcmpb	$0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
	kmovd	%k2, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fourth_vector)

	vpcmpb	$0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
	kmovd	%k3, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fifth_vector)

	vpcmpb	$0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
	add	$(VEC_SIZE * 4), %rax
	kmovd	%k4, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_second_vector)

	vpcmpb	$0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
	kmovd	%k1, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_third_vector)

	vpcmpb	$0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
	kmovd	%k2, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fourth_vector)

	vpcmpb	$0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
	kmovd	%k3, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fifth_vector)

	vpcmpb	$0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
	kmovd	%k4, %edx
	add	$(VEC_SIZE * 4), %rax
	test	%edx, %edx
	jnz	L(exit_null_on_second_vector)

	vpcmpb	$0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
	kmovd	%k1, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_third_vector)

	vpcmpb	$0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
	kmovd	%k2, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fourth_vector)

	vpcmpb	$0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
	kmovd	%k3, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fifth_vector)

	vpcmpb	$0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
	add	$(VEC_SIZE * 4), %rax
	kmovd	%k4, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_second_vector)

	vpcmpb	$0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
	kmovd	%k1, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_third_vector)

	vpcmpb	$0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
	kmovd	%k2, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fourth_vector)

	vpcmpb	$0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
	kmovd	%k3, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fifth_vector)

	test	$((VEC_SIZE * 4) - 1), %rax
	jz	L(align_four_vec_loop)

	vpcmpb	$0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
	add	$(VEC_SIZE * 5), %rax
	kmovd	%k4, %edx
	test	%edx, %edx
	jnz	L(exit)

	test	$((VEC_SIZE * 4) - 1), %rax
	jz	L(align_four_vec_loop)

	vpcmpb	$0, VEC_SIZE(%rax), %YMMZERO, %k0
	add	$VEC_SIZE, %rax
	kmovd	%k0, %edx
	test	%edx, %edx
	jnz	L(exit)

	test	$((VEC_SIZE * 4) - 1), %rax
	jz	L(align_four_vec_loop)

	vpcmpb	$0, VEC_SIZE(%rax), %YMMZERO, %k0
	add	$VEC_SIZE, %rax
	kmovd	%k0, %edx
	test	%edx, %edx
	jnz	L(exit)

	test	$((VEC_SIZE * 4) - 1), %rax
	jz	L(align_four_vec_loop)

	vpcmpb	$0, VEC_SIZE(%rax), %YMMZERO, %k1
	add	$VEC_SIZE, %rax
	kmovd	%k1, %edx
	test	%edx, %edx
	jnz	L(exit)

	add	$VEC_SIZE, %rax

	.p2align 4
L(align_four_vec_loop):
	VMOVA	(%rax), %YMM0
	VMOVA	(VEC_SIZE * 2)(%rax), %YMM1
	vpminub	VEC_SIZE(%rax), %YMM0, %YMM0
	vpminub	(VEC_SIZE * 3)(%rax), %YMM1, %YMM1
	vpminub	%YMM0, %YMM1, %YMM0
	/* If K0 != 0, there is a null byte.  */
	vpcmpb	$0, %YMM0, %YMMZERO, %k0
	add	$(VEC_SIZE * 4), %rax
	ktestd	%k0, %k0
	jz	L(align_four_vec_loop)

	vpcmpb	$0, -(VEC_SIZE * 4)(%rax), %YMMZERO, %k0
	sub	$(VEC_SIZE * 5), %rax
	kmovd	%k0, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_second_vector)

	vpcmpb	$0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
	kmovd	%k1, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_third_vector)

	vpcmpb	$0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
	kmovd	%k2, %edx
	test	%edx, %edx
	jnz	L(exit_null_on_fourth_vector)

	vpcmpb	$0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
	kmovd	%k3, %edx
	sub	%rdi, %rax
	bsf	%rdx, %rdx
	add	%rdx, %rax
	add	$(VEC_SIZE * 4), %rax
	jmp	L(StartStrcpyPart)

	.p2align 4
L(exit):
	sub	%rdi, %rax
L(exit_null_on_first_vector):
	bsf	%rdx, %rdx
	add	%rdx, %rax
	jmp	L(StartStrcpyPart)

	.p2align 4
L(exit_null_on_second_vector):
	sub	%rdi, %rax
	bsf	%rdx, %rdx
	add	%rdx, %rax
	add	$VEC_SIZE, %rax
	jmp	L(StartStrcpyPart)

	.p2align 4
L(exit_null_on_third_vector):
	sub	%rdi, %rax
	bsf	%rdx, %rdx
	add	%rdx, %rax
	add	$(VEC_SIZE * 2), %rax
	jmp	L(StartStrcpyPart)

	.p2align 4
L(exit_null_on_fourth_vector):
	sub	%rdi, %rax
	bsf	%rdx, %rdx
	add	%rdx, %rax
	add	$(VEC_SIZE * 3), %rax
	jmp	L(StartStrcpyPart)

	.p2align 4
L(exit_null_on_fifth_vector):
	sub	%rdi, %rax
	bsf	%rdx, %rdx
	add	%rdx, %rax
	add	$(VEC_SIZE * 4), %rax

	.p2align 4
L(StartStrcpyPart):
	lea	(%r9, %rax), %rdi
	mov	%rsi, %rcx
	mov	%r9, %rax      /* save result */

# ifdef USE_AS_STRNCAT
	test	%r8, %r8
	jz	L(ExitZero)
#  define USE_AS_STRNCPY
# endif

# include "strcpy-evex.S"
#endif