on 2024/4/29 15:20, Alexandre Oliva wrote:
> On Apr 28, 2024, "Kewen.Lin" <li...@linux.ibm.com> wrote:
>
>> OK, from this perspective IMHO it seems more clear to adopt xfail
>> with effective target long_double_64bit?
>
> That's effective target is quite broken, alas. I doubt it's used
> anywhere: it calls an undefined proc, and its memcmp call seems to have
> the size cut&pasto-ed from the 128-bit functions. (a patchlet that
> fixes these most glaring issues is below)
>
> Furthermore, it doesn't really work. Since it adds -mlong-double-64 for
> the effective target test, it overrides the default, so it sort of
> always passes, even on a 128-bit long double target. But since the test
> itself doesn't add that option, any xfails on long_double_64bit would be
> flagged as XPASS.
>
> There's no effective target test for 64-bit long double that doesn't
> override the default, so we'd have to add one. Alas, the natural name
> for it is the one that's taken with overriding behavior, and the current
> option-overriding tests, that need to be used along with the
> corresponding add-options in testcases, might benefit from a renaming to
> make them fit the already-established (?) naming standards. Yuck.
>
Oops, it's really out of my expectation, I just noticed that no test cases
are using this effective target and the commit r12-3151-g4c5d76a655b9ab
contributing this even doesn't adopt it. Thanks for catching this and sorry
that I didn't check it before suggesting it, I think we can aggressively
drop this effective target instead to avoid any possible confusion.
CC Mike for this.
How about the generic one "longdouble64"? I did a grep and found it has one
use, I'd expect it can work here. :)
gcc/testsuite//gcc.target/powerpc/pr99708.c:/* { dg-xfail-run-if "unsupported
type __ibm128 with long-double-64" { longdouble64 } } */
BR,
Kewen
>
> diff --git a/gcc/testsuite/lib/target-supports.exp
> b/gcc/testsuite/lib/target-supports.exp
> index 182d80129de9b..603da25c97d67 100644
> --- a/gcc/testsuite/lib/target-supports.exp
> +++ b/gcc/testsuite/lib/target-supports.exp
> @@ -2961,12 +2961,12 @@ proc check_effective_target_long_double_64bit { } {
> /* eliminate removing volatile cast warning. */
> a2 = a;
> b2 = b;
> - if (memcmp (&a2, &b2, 16) != 0)
> + if (memcmp (&a2, &b2, 8) != 0)
> return 1;
> sprintf (buffer, "%lg", b);
> return strcmp (buffer, "3") != 0;
> }
> - } [add_options_for_ppc_long_double_override_64bit ""]]
> + } [add_options_for_long_double_64bit ""]]
> }
>
> # Return the appropriate options to specify that long double uses the IEEE
>
>
