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
|
#include "Halide.h"
#include <stdio.h>
using namespace Halide;
int main(int argc, char **argv) {
Buffer<int8_t> im(1697);
// A strided load with stride two loads a pair of vectors and
// shuffles out the elements like so:
// A0 A1 A2 A3 B0 B1 B2 B3 -> A0 A2 B0 B2
// That technique applied to the following would read beyond the
// input, so the second load actually gets pushed backwards (or
// valgrind would complain).
Func f, g;
Var x;
f(x) = im(2 * x);
f.compute_root().vectorize(x, 16).bound(x, 0, 849);
// However, it's safe to apply it to this step, because f is an
// internal allocation, and halide_malloc adds a safety margin.
g(x) = f(2 * x);
g.compute_root().vectorize(x, 16).bound(x, 0, 425); // 24 * 2 = 48 < 49
//g.compile_to_assembly("/dev/stdout", std::vector<Argument>(), "g");
g.realize({425});
printf("Success!\n");
return 0;
}
|
