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