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
|
#include "Halide.h"
#include "halide_benchmark.h"
#include <cstdio>
#include <memory>
using namespace Halide;
using namespace Halide::Tools;
void test_deinterleave() {
ImageParam src(UInt(8), 3);
Func dst;
Var x, y, c;
dst(x, y, c) = src(x, y, c);
src.dim(0).set_stride(3).dim(2).set_stride(1).set_bounds(0, 3);
// This is the default format for Halide, but made explicit for illustration.
dst.output_buffer()
.dim(0)
.set_stride(1)
.dim(2)
.set_extent(3);
dst.reorder(c, x, y).unroll(c);
dst.vectorize(x, 16);
// Allocate two 16 megapixel, 3 channel, 8-bit images -- input and output
// Setup src to be RGB interleaved, with no extra padding between channels or rows.
Buffer<uint8_t> src_image = Buffer<uint8_t>::make_interleaved(1 << 12, 1 << 12, 3);
// Setup dst to be planar, with no extra padding between channels or rows.
Buffer<uint8_t> dst_image(1 << 12, 1 << 12, 3);
src_image.for_each_element([&](int x, int y) {
src_image(x, y, 0) = 0;
src_image(x, y, 1) = 128;
src_image(x, y, 2) = 255;
});
dst_image.fill(0);
src.set(src_image);
dst.compile_jit();
// Warm up caches, etc.
dst.realize(dst_image);
double t1 = benchmark([&]() {
dst.realize(dst_image);
});
printf("Interleaved to planar bandwidth %.3e byte/s.\n",
dst_image.number_of_elements() / t1);
dst_image.for_each_element([&](int x, int y) {
assert(dst_image(x, y, 0) == 0);
assert(dst_image(x, y, 1) == 128);
assert(dst_image(x, y, 2) == 255);
});
// Setup a semi-planar output case.
dst_image = Buffer<uint8_t>(1 << 12, 3, 1 << 12);
dst_image.transpose(1, 2);
dst_image.fill(0);
double t2 = benchmark([&]() {
dst.realize(dst_image);
});
dst_image.for_each_element([&](int x, int y) {
assert(dst_image(x, y, 0) == 0);
assert(dst_image(x, y, 1) == 128);
assert(dst_image(x, y, 2) == 255);
});
printf("Interleaved to semi-planar bandwidth %.3e byte/s.\n",
dst_image.number_of_elements() / t2);
}
void test_interleave(bool fast) {
ImageParam src(UInt(8), 3);
Func dst;
Var x, y, c;
dst(x, y, c) = src(x, y, c);
// This is the default format for Halide, but made explicit for illustration.
src.dim(0).set_stride(1).dim(2).set_extent(3);
dst.output_buffer()
.dim(0)
.set_stride(3)
.dim(2)
.set_stride(1)
.set_bounds(0, 3);
if (fast) {
dst.reorder(c, x, y).bound(c, 0, 3).unroll(c);
dst.vectorize(x, 16);
} else {
dst.reorder(c, x, y).vectorize(x, 16);
}
// Allocate two 16 megapixel, 3 channel, 8-bit images -- input and output
// Setup src to be planar
Buffer<uint8_t> src_image(1 << 12, 1 << 12, 3);
// Setup dst to be interleaved
Buffer<uint8_t> dst_image = Buffer<uint8_t>::make_interleaved(1 << 12, 1 << 12, 3);
src_image.for_each_element([&](int x, int y) {
src_image(x, y, 0) = 0;
src_image(x, y, 1) = 128;
src_image(x, y, 2) = 255;
});
dst_image.fill(0);
src.set(src_image);
if (fast) {
dst.compile_to_lowered_stmt("rgb_interleave_fast.stmt", dst.infer_arguments());
} else {
dst.compile_to_lowered_stmt("rgb_interleave_slow.stmt", dst.infer_arguments());
}
// Warm up caches, etc.
dst.realize(dst_image);
double t = benchmark([&]() {
dst.realize(dst_image);
});
printf("Planar to interleaved bandwidth %.3e byte/s.\n",
dst_image.number_of_elements() / t);
dst_image.for_each_element([&](int x, int y) {
assert(dst_image(x, y, 0) == 0);
assert(dst_image(x, y, 1) == 128);
assert(dst_image(x, y, 2) == 255);
});
}
int main(int argc, char **argv) {
Target target = get_jit_target_from_environment();
if (target.arch == Target::WebAssembly) {
printf("[SKIP] Performance tests are meaningless and/or misleading under WebAssembly interpreter.\n");
return 0;
}
test_deinterleave();
test_interleave(false);
test_interleave(true);
printf("Success!\n");
return 0;
}
|
