view tests/mini/intrinsics_ovf.d @ 1404:11b122f92136

Now that templates instantiations are no longer emitted for all modules that even blink at them they seem to break due to being linkonce (if compiled with any optimization level > 0), so let's give them weak linkage instead. The difference is that unreferenced linkonce symbols can be deleted, while weak symbols need to be preserved.
author Frits van Bommel <fvbommel wxs.nl>
date Thu, 21 May 2009 15:23:28 +0200
parents 34f2fd925de3
children
line wrap: on
line source

module intrinsics_ovf;


//version = PRINTF;

version(PRINTF)
    extern(C) int printf(char*, ...);


import ldc.intrinsics;


int saddo(int a, int b, out bool overflow) {
    auto Result = llvm_sadd_with_overflow(a, b);
    overflow = Result.overflow;
    return Result.result;
}

int uaddo(int a, int b, out bool overflow) {
    auto Result = llvm_uadd_with_overflow(a, b);
    overflow = Result.overflow;
    return Result.result;
}

int smulo(int a, int b, out bool overflow) {
    auto Result = llvm_smul_with_overflow(a, b);
    overflow = Result.overflow;
    return Result.result;
}

/*
uint umulo(uint a, uint b, out bool overflow) {
    auto Result = llvm_umul_with_overflow(a, b);
    overflow = Result.overflow;
    return Result.result;
}
*/

void test(int function(int, int, out bool) fn,
          int a, int b, int result_e, bool ovf_e) {
    version(PRINTF)
        printf("%8x :: %8x :: %8x :: %.*s\n", a, b, result_e,
                (ovf_e ? "true" : "false"));
    
    bool ovf;
    int result = fn(a, b, ovf);
    
    version(PRINTF)
        printf("____________________    %8x :: %.*s\n", result,
                (ovf ? "true" : "false"));
    
    assert(ovf == ovf_e);
    assert(result == result_e);
}

void main() {
    test(&saddo, int.min, int.min, int.min + int.min, true);
    test(&saddo, int.min, int.max, int.min + int.max, false);
    test(&saddo, 1, int.max, 1 + int.max, true);
    test(&saddo, 1, 2, 3, false);
    test(&saddo, -1, -2, -3, false);
    
    test(&uaddo, 0, uint.max, 0 + uint.max, false);
    test(&uaddo, 1, uint.max, 1 + uint.max, true);
    test(&uaddo, 1, 2, 3, false);

    test(&smulo, int.min, int.min, int.min * int.min, true);
    test(&smulo, int.min, int.max, int.min * int.max, true);
    test(&smulo, int.max, int.max, int.max * int.max, true);
    test(&smulo, 1, int.max, 1 * int.max, false);
    test(&smulo, 2, int.max/2, 2 * (int.max/2), false);
    test(&smulo, 2, int.max/2 + 1, 2 * (int.max/2 + 1), true);
    test(&smulo, 2, int.min/2, 2 * (int.min/2), false);
    test(&smulo, 2, int.min/2 - 1, 2 * (int.min/2 - 1), true);
    test(&smulo, 1, 2, 2, false);
    test(&smulo, -1, -2, 2, false);
}