https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56457
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-11-10
Ever confirmed|0 |1
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Nicholas Krause from comment #2)
> defs = DF_REF_CHAIN (use);
>
> if (!defs)
>
> {
>
> unsigned int regno = DF_REF_REGNO (use);
>
>
>
> /* If this is the use of an uninitialized argument register that is
>
> likely to be spilled, do not move it lest this might extend its
>
> lifetime and cause reload to die. This can occur for a call to
>
> a function taking complex number arguments and moving the insns
>
> preparing the arguments without moving the call itself wouldn't
>
> gain much in practice. */
>
> if ((DF_REF_FLAGS (use) & DF_HARD_REG_LIVE)
>
> && FUNCTION_ARG_REGNO_P (regno)
>
> && targetm.class_likely_spilled_p (REGNO_REG_CLASS (regno)))
>
> return false;
>
>
>
> return true;
>
> }
>
> This is the actual code and it seems to be used not in the if block below it
> Eric. I haven't run a build for it on the current gcc sources but it seems
> to be used currently. As for memory I don't recall it happening during my
> latest gcc builds on the upstream sources.
ok I guess I'll take this as confirmation then.
