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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
int64_t mac_w(int64_t mac, const int16_t *a, const int16_t *b)
{
register uint32_t macl __asm__("macl") = mac;
register uint32_t mach __asm__("mach") = mac >> 32;
asm volatile("mac.w @%0+,@%1+"
: "+r"(a), "+r"(b), "+x"(macl), "+x"(mach));
return ((uint64_t)mach << 32) | macl;
}
typedef struct {
int64_t mac;
int16_t a, b;
int64_t res[2];
} Test;
__attribute__((noinline))
void test(const Test *t, int sat)
{
int64_t res;
if (sat) {
asm volatile("sets");
} else {
asm volatile("clrs");
}
res = mac_w(t->mac, &t->a, &t->b);
if (res != t->res[sat]) {
fprintf(stderr, "%#llx + (%#x * %#x) = %#llx -- got %#llx\n",
t->mac, t->a, t->b, t->res[sat], res);
abort();
}
}
int main()
{
static const Test tests[] = {
{ 0, 2, 3, { 6, 6 } },
{ 0x123456787ffffffell, 2, -3,
{ 0x123456787ffffff8ll, 0x123456787ffffff8ll } },
{ 0xabcdef127ffffffall, 2, 3,
{ 0xabcdef1280000000ll, 0x000000017fffffffll } },
{ 0xfffffffffll, INT16_MAX, INT16_MAX,
{ 0x103fff0000ll, 0xf3fff0000ll } },
};
for (int i = 0; i < sizeof(tests) / sizeof(tests[0]); ++i) {
for (int j = 0; j < 2; ++j) {
test(&tests[i], j);
}
}
return 0;
}
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