| 1 | // RUN: %clang_builtins %s %librt -o %t && %run %t |
|---|---|
| 2 | // REQUIRES: librt_has_paritydi2 |
| 3 | |
| 4 | #include "int_lib.h" |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | |
| 8 | // Returns: 1 if number of bits is odd else returns 0 |
| 9 | |
| 10 | COMPILER_RT_ABI int __paritydi2(di_int a); |
| 11 | |
| 12 | int naive_parity(di_int a) |
| 13 | { |
| 14 | int r = 0; |
| 15 | for (; a; a = a & (a - 1)) |
| 16 | r = ~r; |
| 17 | return r & 1; |
| 18 | } |
| 19 | |
| 20 | int test__paritydi2(di_int a) |
| 21 | { |
| 22 | si_int x = __paritydi2(a); |
| 23 | si_int expected = naive_parity(a); |
| 24 | if (x != expected) |
| 25 | printf(format: "error in __paritydi2(0x%llX) = %d, expected %d\n", |
| 26 | a, x, expected); |
| 27 | return x != expected; |
| 28 | } |
| 29 | |
| 30 | char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0}; |
| 31 | char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0}; |
| 32 | |
| 33 | int main() |
| 34 | { |
| 35 | int i; |
| 36 | for (i = 0; i < 10000; ++i) |
| 37 | if (test__paritydi2(a: ((di_int)rand() << 32) + rand())) |
| 38 | return 1; |
| 39 | |
| 40 | return 0; |
| 41 | } |
| 42 |