runtime/test/Unit/floatdidf_test.c

//===-- floatdidf.c - Test __floatdidf ------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file tests __floatdidf for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

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

// Returns: convert a to a double, rounding toward even.

// Assumption: double is a IEEE 64 bit floating point type 
//             di_int is a 64 bit integral type

// seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm

double __floatdidf(di_int a);

int test__floatdidf(di_int a, double expected)
{
    double x = __floatdidf(a);
    if (x != expected)
        printf("error in __floatdidf(%llX) = %a, expected %a\n", a, x, expected);
    return x != expected;
}

char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
char assumption_2[sizeof(di_int)*CHAR_BIT == 64] = {0};
char assumption_3[sizeof(double)*CHAR_BIT == 64] = {0};

int main()
{
    if (test__floatdidf(0, 0.0))
        return 1;

    if (test__floatdidf(1, 1.0))
        return 1;
    if (test__floatdidf(2, 2.0))
        return 1;
    if (test__floatdidf(20, 20.0))
        return 1;
    if (test__floatdidf(-1, -1.0))
        return 1;
    if (test__floatdidf(-2, -2.0))
        return 1;
    if (test__floatdidf(-20, -20.0))
        return 1;

    if (test__floatdidf(0x7FFFFF8000000000LL, 0x1.FFFFFEp+62))
        return 1;
    if (test__floatdidf(0x7FFFFFFFFFFFF800LL, 0x1.FFFFFFFFFFFFEp+62))
        return 1;
    if (test__floatdidf(0x7FFFFF0000000000LL, 0x1.FFFFFCp+62))
        return 1;
    if (test__floatdidf(0x7FFFFFFFFFFFF000LL, 0x1.FFFFFFFFFFFFCp+62))
        return 1;

    if (test__floatdidf(0x8000008000000000LL, -0x1.FFFFFEp+62))
        return 1;
    if (test__floatdidf(0x8000000000000800LL, -0x1.FFFFFFFFFFFFEp+62))
        return 1;
    if (test__floatdidf(0x8000010000000000LL, -0x1.FFFFFCp+62))
        return 1;
    if (test__floatdidf(0x8000000000001000LL, -0x1.FFFFFFFFFFFFCp+62))
        return 1;

    if (test__floatdidf(0x8000000000000000LL, -0x1.000000p+63))
        return 1;
    if (test__floatdidf(0x8000000000000001LL, -0x1.000000p+63))
        return 1;

    if (test__floatdidf(0x0007FB72E8000000LL, 0x1.FEDCBAp+50))
        return 1;

    if (test__floatdidf(0x0007FB72EA000000LL, 0x1.FEDCBA8p+50))
        return 1;
    if (test__floatdidf(0x0007FB72EB000000LL, 0x1.FEDCBACp+50))
        return 1;
    if (test__floatdidf(0x0007FB72EBFFFFFFLL, 0x1.FEDCBAFFFFFFCp+50))
        return 1;
    if (test__floatdidf(0x0007FB72EC000000LL, 0x1.FEDCBBp+50))
        return 1;
    if (test__floatdidf(0x0007FB72E8000001LL, 0x1.FEDCBA0000004p+50))
        return 1;

    if (test__floatdidf(0x0007FB72E6000000LL, 0x1.FEDCB98p+50))
        return 1;
    if (test__floatdidf(0x0007FB72E7000000LL, 0x1.FEDCB9Cp+50))
        return 1;
    if (test__floatdidf(0x0007FB72E7FFFFFFLL, 0x1.FEDCB9FFFFFFCp+50))
        return 1;
    if (test__floatdidf(0x0007FB72E4000001LL, 0x1.FEDCB90000004p+50))
        return 1;
    if (test__floatdidf(0x0007FB72E4000000LL, 0x1.FEDCB9p+50))
        return 1;

    if (test__floatdidf(0x023479FD0E092DC0LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DA1LL, 0x1.1A3CFE870496Dp+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DB0LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DB8LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DB6LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DBFLL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DC1LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DC7LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DC8LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DCFLL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DD0LL, 0x1.1A3CFE870496Ep+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DD1LL, 0x1.1A3CFE870496Fp+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DD8LL, 0x1.1A3CFE870496Fp+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DDFLL, 0x1.1A3CFE870496Fp+57))
        return 1;
    if (test__floatdidf(0x023479FD0E092DE0LL, 0x1.1A3CFE870496Fp+57))
        return 1;

   return 0;
}