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
|
#include "Halide.h"
#include "halide_benchmark.h"
using namespace Halide;
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;
}
double times[3] = {0.f, 0.f, 0.f};
for (int i = 0; i < 3; i++) {
for (int c = 0; c < 3; c++) {
MemoryType mem_type;
bool use_bound;
// Check three cases:
if (c == 0) {
// Allocation on the stack where size is known.
mem_type = MemoryType::Stack;
use_bound = true;
} else if (c == 1) {
// Allocation on the stack where the size is dynamic
mem_type = MemoryType::Stack;
use_bound = false;
} else {
// Allocation on the heap where the size is dynamic
mem_type = MemoryType::Heap;
use_bound = false;
}
Func f;
Var x, y;
f(x, y) = x / 18.3f + y;
Func g;
g(x, y) = f(x, y) + f(x, y + 1);
Var yo, yi;
// Place the y loop body in its own function with its own
// stack frame by making a parallel loop of some size
// which will be 1 in practice.
Param<int> task_size;
g.split(y, yo, yi, task_size).parallel(yi);
f.compute_at(g, yi).store_in(mem_type);
if (use_bound) {
f.bound_extent(x, 8);
}
Buffer<float> out(8, 1024);
task_size.set(1);
double t = 1e3 * Tools::benchmark(10, 100, [&]() {
g.realize(out);
});
times[c] += t;
}
}
printf("Constant-sized stack allocation: %f\n"
"Use alloca: %f\n"
"Use malloc: %f\n",
times[0], times[1], times[2]);
if (times[0] > times[2] || times[1] > times[2]) {
printf("Stack allocations should be cheaper than heap allocations\n");
return 1;
}
printf("Success!\n");
return 0;
}
|
