[MinGW-notify] [ mingw-Bugs-3420359 ] Missing atomic builtins

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Bugs item #3420359, was opened at 2011-10-07 15:46
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: antran ()
Assigned to: Nobody/Anonymous (nobody)
Summary: Missing atomic builtins

Initial Comment:
Given the same OS (Windows) and the same arch (X86), it's quite weird that
MinGW-W64 GCC or Cygwin GCC does have support for atomic builtins but 
MinGW GCC doesnt. 

For more details, please see c++config.h for _GLIBCXX_ATOMIC_BUILTINS* macro
definitions.

Test case:

#include <stdint.h>

struct AtomicBuiltins
{
    template <class T>
    static void check() 
    {
        T value = 0;
        __sync_fetch_and_add(&value, 0);
        __sync_fetch_and_sub(&value, 0);
        __sync_fetch_and_or(&value, 0);
        __sync_fetch_and_and(&value, 0);
        __sync_fetch_and_xor(&value, 0);
        __sync_fetch_and_nand(&value, 0);
        
        __sync_add_and_fetch(&value, 0);
        __sync_sub_and_fetch(&value, 0);
        __sync_or_and_fetch(&value, 0);
        __sync_and_and_fetch(&value, 0);
        __sync_xor_and_fetch(&value, 0);
        __sync_nand_and_fetch(&value, 0);
        
        __sync_bool_compare_and_swap(&value, 0, 1);
        __sync_val_compare_and_swap(&value, 1, 2);
        
        __sync_lock_test_and_set(&value, 1);
        __sync_lock_release(&value);
        __sync_synchronize();
    }
};

int
main()
{
    AtomicBuiltins::check<int8_t>();
    AtomicBuiltins::check<int16_t>();
    AtomicBuiltins::check<int32_t>();
    AtomicBuiltins::check<int64_t>();
    return 0;
}

Please note that atomic builtins are required for stuffs like std::exception_ptr
or std::atomic.

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