llvm-project/compiler-rt/test/Unit/subvsi3_test.c

//===-- subvsi3_test.c - Test __subvsi3 -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file tests __subvsi3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"
#include <stdio.h>
#include <stdlib.h>

// Returns: a - b

// Effects: aborts if a - b overflows

si_int __subvsi3(si_int a, si_int b);

int test__subvsi3(si_int a, si_int b)
{
    si_int x = __subvsi3(a, b);
    si_int expected = a - b;
    if (x != expected)
        printf("error in test__subvsi3(0x%X, 0x%X) = %d, expected %d\n",
               a, b, x, expected);
    return x != expected;
}

int main()
{
//     test__subvsi3(0x80000000, 1);  // should abort
//     test__subvsi3(0, 0x80000000);  // should abort
//     test__subvsi3(1, 0x80000000);  // should abort
//     test__subvsi3(0x7FFFFFFF, -1);  // should abort
//     test__subvsi3(-2, 0x7FFFFFFF);  // should abort

    if (test__subvsi3(0x80000000, -1))
        return 1;
    if (test__subvsi3(0x80000000, 0))
        return 1;
    if (test__subvsi3(-1, 0x80000000))
        return 1;
    if (test__subvsi3(0x7FFFFFFF, 1))
        return 1;
    if (test__subvsi3(0x7FFFFFFF, 0))
        return 1;
    if (test__subvsi3(1, 0x7FFFFFFF))
        return 1;
    if (test__subvsi3(0, 0x7FFFFFFF))
        return 1;
    if (test__subvsi3(-1, 0x7FFFFFFF))
        return 1;

    return 0;
}