On 09/08/2021 08:51, Sebastian Huber wrote:
Hello,
I would like to use gcov for a multi-threaded program running on an SMP
machine using a 32-bit SPARC/LEON3 target. This target supports
HAVE_atomic_compare_and_swapsi but not HAVE_atomic_compare_and_swapdi.
Unfortunately we have:
/* Return the type node for gcov_type. */
tree
get_gcov_type (void)
{
scalar_int_mode mode
= smallest_int_mode_for_size (LONG_LONG_TYPE_SIZE > 32 ? 64 : 32);
return lang_hooks.types.type_for_mode (mode, false);
}
The long long type is 64-bit, the get_gcov_type() returns a 64-bit type.
This disables the atomic support in tree_profiling().
For what is the gcov type used? Could we add an option to force it to
32-bit? What would be the consequences?
Another option would be to add something like an
-fprofile-update=force-atomic option which would resort to libatomic.
Which would deliver bad performance, however, correct results in a
multi-threaded program I guess.
Here is a proposed patch:
https://gcc.gnu.org/pipermail/gcc-patches/2021-August/576947.html
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