view tests/mini/intrinsics_ovf.d @ 1499:df11cdec45a2

Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324. The idea is to separate the notion of const from 'this variable can always be replaced with its initializer' in the frontend. To do that, I introduced Declaration::isSameAsInitializer, which is overridden in VarDeclaration to return false for constants that have a struct literal initializer. So {{{ const S s = S(5); void foo() { auto ps = &s; } // is no longer replaced by void foo() { auto ps = &(S(5)); } }}} To make taking the address of a struct constant with a struct-initializer outside of function scope possible, I made sure that AddrExp::optimize doesn't try to run the argument's optimization with WANTinterpret - that'd again replace the constant with a struct literal temporary.
author Christian Kamm <kamm incasoftware de>
date Sun, 14 Jun 2009 19:49:58 +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);
}