| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | |
| 3 | #include <limits.h> |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | |
| 7 | static void subv(const int a, const int b, const int res, const int carry) |
| 8 | { |
| 9 | int o = a, c; |
| 10 | |
| 11 | asm volatile("subv %2,%0\n" |
| 12 | "movt %1\n" |
| 13 | : "+r"(o), "=r"(c) : "r"(b) : ); |
| 14 | |
| 15 | if (c != carry || o != res) { |
| 16 | printf("SUBV %d, %d = %d/%d [T = %d/%d]\n", a, b, o, res, c, carry); |
| 17 | abort(); |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | int main(void) |
| 22 | { |
| 23 | subv(INT_MIN, 1, INT_MAX, 1); |
| 24 | subv(INT_MAX, -1, INT_MIN, 1); |
| 25 | subv(INT_MAX, 1, INT_MAX - 1, 0); |
| 26 | subv(0, 1, -1, 0); |
| 27 | subv(-1, -1, 0, 0); |
| 28 | |
| 29 | return 0; |
| 30 | } |