| 1 | // RUN: %clang_builtins %s %librt -o %t && %run %t |
|---|---|
| 2 | // REQUIRES: librt_has_parityti2 |
| 3 | // REQUIRES: int128 |
| 4 | |
| 5 | #include "int_lib.h" |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | |
| 9 | #ifdef CRT_HAS_128BIT |
| 10 | |
| 11 | // Returns: 1 if number of bits is odd else returns 0 |
| 12 | |
| 13 | COMPILER_RT_ABI int __parityti2(ti_int a); |
| 14 | |
| 15 | int naive_parity(ti_int a) |
| 16 | { |
| 17 | int r = 0; |
| 18 | for (; a; a = a & (a - 1)) |
| 19 | r = ~r; |
| 20 | return r & 1; |
| 21 | } |
| 22 | |
| 23 | int test__parityti2(ti_int a) |
| 24 | { |
| 25 | si_int x = __parityti2(a); |
| 26 | si_int expected = naive_parity(a); |
| 27 | if (x != expected) |
| 28 | { |
| 29 | twords at; |
| 30 | at.all = a; |
| 31 | printf(format: "error in __parityti2(0x%.16llX%.16llX) = %d, expected %d\n", |
| 32 | at.s.high, at.s.low, x, expected); |
| 33 | } |
| 34 | return x != expected; |
| 35 | } |
| 36 | |
| 37 | char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0}; |
| 38 | char assumption_2[sizeof(di_int)*CHAR_BIT == 64] = {0}; |
| 39 | |
| 40 | #endif |
| 41 | |
| 42 | int main() |
| 43 | { |
| 44 | #ifdef CRT_HAS_128BIT |
| 45 | int i; |
| 46 | for (i = 0; i < 10000; ++i) |
| 47 | if (test__parityti2(a: ((ti_int)rand() << 96) + ((ti_int)rand() << 64) + |
| 48 | ((ti_int)rand() << 32) + rand())) |
| 49 | return 1; |
| 50 | |
| 51 | #else |
| 52 | printf("skipped\n"); |
| 53 | #endif |
| 54 | return 0; |
| 55 | } |
| 56 |