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#include "Halide.h"
#include <stdint.h>
#include <stdio.h>
#include <string>
using namespace Halide;
template<typename T>
T local_popcount(T v) {
T count = 0;
while (v) {
if (v & 1) ++count;
v >>= 1;
}
return count;
}
template<typename T>
T local_count_trailing_zeros(T v) {
const int bits = sizeof(T) * 8;
for (T b = 0; b < bits; ++b) {
if (v & (1 << b)) {
// found a set bit
return b;
}
}
return bits;
}
template<typename T>
T local_count_leading_zeros(T v) {
const int bits = sizeof(T) * 8;
for (T b = 0; b < bits; ++b) {
if (v & (1 << (bits - 1 - b))) {
// found a set bit
return b;
}
}
return bits;
}
template<typename T>
std::string as_bits(T v) {
const int bits = sizeof(T) * 8;
std::string ret;
for (int i = bits - 1; i >= 0; --i)
ret += (v & (1 << i)) ? '1' : '0';
return ret;
}
Var x("x");
void schedule(Func f, const Target &t) {
// TODO: Add GPU schedule where supported.
if (t.has_feature(Target::HVX)) {
f.hexagon().vectorize(x, 128);
} else {
f.vectorize(x, 16);
}
}
template<typename T>
int test_bit_counting(const Target &target) {
Buffer<T> input(256);
for (int i = 0; i < 256; i++) {
if (i < 16) {
input(i) = i;
} else if (i < 32) {
input(i) = 0xffffffffUL - i;
} else {
input(i) = rand();
}
}
Func popcount_test("popcount_test");
popcount_test(x) = popcount(input(x));
schedule(popcount_test, target);
Buffer<T> popcount_result = popcount_test.realize({256});
for (int i = 0; i < 256; ++i) {
if (popcount_result(i) != local_popcount(input(i))) {
std::string bits_string = as_bits(input(i));
printf("Popcount of %u [0b%s] returned %d (should be %d)\n",
input(i), bits_string.c_str(), popcount_result(i),
local_popcount(input(i)));
return 1;
}
}
Func ctlz_test("ctlz_test");
ctlz_test(x) = count_leading_zeros(input(x));
schedule(ctlz_test, target);
Buffer<T> ctlz_result = ctlz_test.realize({256});
for (int i = 0; i < 256; ++i) {
if (ctlz_result(i) != local_count_leading_zeros(input(i))) {
std::string bits_string = as_bits(input(i));
printf("Ctlz of %u [0b%s] returned %d (should be %d)\n",
input(i), bits_string.c_str(), ctlz_result(i),
local_count_leading_zeros(input(i)));
return 1;
}
}
Func cttz_test("cttz_test");
cttz_test(x) = count_trailing_zeros(input(x));
schedule(cttz_test, target);
Buffer<T> cttz_result = cttz_test.realize({256});
for (int i = 0; i < 256; ++i) {
if (cttz_result(i) != local_count_trailing_zeros(input(i))) {
std::string bits_string = as_bits(input(i));
printf("Cttz of %u [0b%s] returned %d (should be %d)\n",
input(i), bits_string.c_str(), cttz_result(i),
local_count_trailing_zeros(input(i)));
return 1;
}
}
return 0;
}
int main() {
Target target = get_jit_target_from_environment();
if (test_bit_counting<uint16_t>(target) != 0) return 1;
if (test_bit_counting<uint32_t>(target) != 0) return 1;
printf("Success!\n");
return 0;
}
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