| 1 | // RUN: %clang_builtins %s %librt -o %t && %run %t |
|---|---|
| 2 | // REQUIRES: librt_has_popcountsi2 |
| 3 | |
| 4 | #include "int_lib.h" |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | |
| 8 | // Returns: count of 1 bits |
| 9 | |
| 10 | COMPILER_RT_ABI int __popcountsi2(si_int a); |
| 11 | |
| 12 | int naive_popcount(si_int a) |
| 13 | { |
| 14 | int r = 0; |
| 15 | for (; a; a = (su_int)a >> 1) |
| 16 | r += a & 1; |
| 17 | return r; |
| 18 | } |
| 19 | |
| 20 | int test__popcountsi2(si_int a) |
| 21 | { |
| 22 | si_int x = __popcountsi2(a); |
| 23 | si_int expected = naive_popcount(a); |
| 24 | if (x != expected) |
| 25 | printf(format: "error in __popcountsi2(0x%X) = %d, expected %d\n", |
| 26 | a, x, expected); |
| 27 | return x != expected; |
| 28 | } |
| 29 | |
| 30 | char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0}; |
| 31 | |
| 32 | int main() |
| 33 | { |
| 34 | if (test__popcountsi2(a: 0)) |
| 35 | return 1; |
| 36 | if (test__popcountsi2(a: 1)) |
| 37 | return 1; |
| 38 | if (test__popcountsi2(a: 2)) |
| 39 | return 1; |
| 40 | if (test__popcountsi2(a: 0xFFFFFFFD)) |
| 41 | return 1; |
| 42 | if (test__popcountsi2(a: 0xFFFFFFFE)) |
| 43 | return 1; |
| 44 | if (test__popcountsi2(a: 0xFFFFFFFF)) |
| 45 | return 1; |
| 46 | int i; |
| 47 | for (i = 0; i < 10000; ++i) |
| 48 | if (test__popcountsi2(a: rand())) |
| 49 | return 1; |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 |