| Daniel Dunbar | fd08999 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 1 | //===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file tests __popcountsi2 for the compiler_rt library. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "int_lib.h" |
| 15 | #include <stdio.h> |
| 16 | #include <stdlib.h> |
| 17 | |
| 18 | // Returns: count of 1 bits |
| 19 | |
| 20 | si_int __popcountsi2(si_int a); |
| 21 | |
| 22 | int naive_popcount(si_int a) |
| 23 | { |
| 24 | int r = 0; |
| 25 | for (; a; a = (su_int)a >> 1) |
| 26 | r += a & 1; |
| 27 | return r; |
| 28 | } |
| 29 | |
| 30 | int test__popcountsi2(si_int a) |
| 31 | { |
| 32 | si_int x = __popcountsi2(a); |
| 33 | si_int expected = naive_popcount(a); |
| 34 | if (x != expected) |
| 35 | printf("error in __popcountsi2(0x%X) = %d, expected %d\n", |
| 36 | a, x, expected); |
| 37 | return x != expected; |
| 38 | } |
| 39 | |
| 40 | char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0}; |
| 41 | |
| 42 | int main() |
| 43 | { |
| 44 | if (test__popcountsi2(0)) |
| 45 | return 1; |
| 46 | if (test__popcountsi2(1)) |
| 47 | return 1; |
| 48 | if (test__popcountsi2(2)) |
| 49 | return 1; |
| 50 | if (test__popcountsi2(0xFFFFFFFD)) |
| 51 | return 1; |
| 52 | if (test__popcountsi2(0xFFFFFFFE)) |
| 53 | return 1; |
| 54 | if (test__popcountsi2(0xFFFFFFFF)) |
| 55 | return 1; |
| 56 | int i; |
| 57 | for (i = 0; i < 10000; ++i) |
| 58 | if (test__popcountsi2(rand())) |
| 59 | return 1; |
| 60 | |
| 61 | return 0; |
| 62 | } |