1// RUN: %clang_builtins %s %librt -o %t && %run %t 2//===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 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 20COMPILER_RT_ABI si_int __popcountsi2(si_int a); 21 22int 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 30int 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 40char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0}; 41 42int 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} 63