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
|
//===-- Implementation of bcmp --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_STRING_MEMORY_UTILS_BCMP_IMPLEMENTATIONS_H
#define LLVM_LIBC_SRC_STRING_MEMORY_UTILS_BCMP_IMPLEMENTATIONS_H
#include "src/__support/common.h"
#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY LIBC_LOOP_NOUNROLL
#include "src/__support/macros/properties/architectures.h"
#include "src/string/memory_utils/op_aarch64.h"
#include "src/string/memory_utils/op_builtin.h"
#include "src/string/memory_utils/op_generic.h"
#include "src/string/memory_utils/op_x86.h"
#include <stddef.h> // size_t
namespace __llvm_libc {
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_embedded_tiny(CPtr p1, CPtr p2, size_t count) {
LIBC_LOOP_NOUNROLL
for (size_t offset = 0; offset < count; ++offset)
if (auto value = generic::Bcmp<1>::block(p1 + offset, p2 + offset))
return value;
return BcmpReturnType::ZERO();
}
#if defined(LIBC_TARGET_ARCH_IS_X86) || defined(LIBC_TARGET_ARCH_IS_AARCH64)
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_generic_gt16(CPtr p1, CPtr p2, size_t count) {
if (count < 256)
return generic::Bcmp<16>::loop_and_tail(p1, p2, count);
if (auto value = generic::Bcmp<64>::block(p1, p2))
return value;
align_to_next_boundary<64, Arg::P1>(p1, p2, count);
return generic::Bcmp<64>::loop_and_tail(p1, p2, count);
}
#endif // defined(LIBC_TARGET_ARCH_IS_X86) ||
// defined(LIBC_TARGET_ARCH_IS_AARCH64)
#if defined(LIBC_TARGET_ARCH_IS_X86)
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_x86_sse2_gt16(CPtr p1, CPtr p2, size_t count) {
if (count <= 32)
return x86::sse2::Bcmp<16>::head_tail(p1, p2, count);
if (count < 256)
return x86::sse2::Bcmp<16>::loop_and_tail(p1, p2, count);
if (auto value = x86::sse2::Bcmp<16>::block(p1, p2))
return value;
align_to_next_boundary<16, Arg::P1>(p1, p2, count);
return x86::sse2::Bcmp<64>::loop_and_tail(p1, p2, count);
}
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_x86_avx2_gt16(CPtr p1, CPtr p2, size_t count) {
if (count <= 32)
return x86::sse2::Bcmp<16>::head_tail(p1, p2, count);
if (count <= 64)
return x86::avx2::Bcmp<32>::head_tail(p1, p2, count);
if (count <= 128)
return x86::avx2::Bcmp<64>::head_tail(p1, p2, count);
if (LIBC_UNLIKELY(count >= 256)) {
if (auto value = x86::avx2::Bcmp<64>::block(p1, p2))
return value;
align_to_next_boundary<64, Arg::P1>(p1, p2, count);
}
return x86::avx2::Bcmp<64>::loop_and_tail(p1, p2, count);
}
[[maybe_unused]] LIBC_INLINE BcmpReturnType
inline_bcmp_x86_avx512bw_gt16(CPtr p1, CPtr p2, size_t count) {
if (count <= 32)
return x86::sse2::Bcmp<16>::head_tail(p1, p2, count);
if (count <= 64)
return x86::avx2::Bcmp<32>::head_tail(p1, p2, count);
if (count <= 128)
return x86::avx512bw::Bcmp<64>::head_tail(p1, p2, count);
if (LIBC_UNLIKELY(count >= 256)) {
if (auto value = x86::avx512bw::Bcmp<64>::block(p1, p2))
return value;
align_to_next_boundary<64, Arg::P1>(p1, p2, count);
}
return x86::avx512bw::Bcmp<64>::loop_and_tail(p1, p2, count);
}
[[maybe_unused]] LIBC_INLINE BcmpReturnType inline_bcmp_x86(CPtr p1, CPtr p2,
size_t count) {
if (count == 0)
return BcmpReturnType::ZERO();
if (count == 1)
return generic::Bcmp<1>::block(p1, p2);
if (count == 2)
return generic::Bcmp<2>::block(p1, p2);
if (count <= 4)
return generic::Bcmp<2>::head_tail(p1, p2, count);
if (count <= 8)
return generic::Bcmp<4>::head_tail(p1, p2, count);
if (count <= 16)
return generic::Bcmp<8>::head_tail(p1, p2, count);
if constexpr (x86::kAvx512BW)
return inline_bcmp_x86_avx512bw_gt16(p1, p2, count);
else if constexpr (x86::kAvx2)
return inline_bcmp_x86_avx2_gt16(p1, p2, count);
else if constexpr (x86::kSse2)
return inline_bcmp_x86_sse2_gt16(p1, p2, count);
else
return inline_bcmp_generic_gt16(p1, p2, count);
}
#endif // defined(LIBC_TARGET_ARCH_IS_X86)
#if defined(LIBC_TARGET_ARCH_IS_AARCH64)
[[maybe_unused]] LIBC_INLINE BcmpReturnType inline_bcmp_aarch64(CPtr p1,
CPtr p2,
size_t count) {
if (LIBC_LIKELY(count <= 32)) {
if (LIBC_UNLIKELY(count >= 16)) {
return aarch64::Bcmp<16>::head_tail(p1, p2, count);
}
switch (count) {
case 0:
return BcmpReturnType::ZERO();
case 1:
return generic::Bcmp<1>::block(p1, p2);
case 2:
return generic::Bcmp<2>::block(p1, p2);
case 3:
return generic::Bcmp<2>::head_tail(p1, p2, count);
case 4:
return generic::Bcmp<4>::block(p1, p2);
case 5:
case 6:
case 7:
return generic::Bcmp<4>::head_tail(p1, p2, count);
case 8:
return generic::Bcmp<8>::block(p1, p2);
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
return generic::Bcmp<8>::head_tail(p1, p2, count);
}
}
if (count <= 64)
return aarch64::Bcmp<32>::head_tail(p1, p2, count);
// Aligned loop if > 256, otherwise normal loop
if (LIBC_UNLIKELY(count > 256)) {
if (auto value = aarch64::Bcmp<32>::block(p1, p2))
return value;
align_to_next_boundary<16, Arg::P1>(p1, p2, count);
}
return aarch64::Bcmp<32>::loop_and_tail(p1, p2, count);
}
#endif // defined(LIBC_TARGET_ARCH_IS_AARCH64)
LIBC_INLINE BcmpReturnType inline_bcmp(CPtr p1, CPtr p2, size_t count) {
#if defined(LIBC_TARGET_ARCH_IS_X86)
return inline_bcmp_x86(p1, p2, count);
#elif defined(LIBC_TARGET_ARCH_IS_AARCH64)
return inline_bcmp_aarch64(p1, p2, count);
#else
return inline_bcmp_embedded_tiny(p1, p2, count);
#endif
}
LIBC_INLINE int inline_bcmp(const void *p1, const void *p2, size_t count) {
return static_cast<int>(inline_bcmp(reinterpret_cast<CPtr>(p1),
reinterpret_cast<CPtr>(p2), count));
}
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_BCMP_IMPLEMENTATIONS_H
|
