[Bug target/63304] Aarch64 pc-relative load offset out of range

[ard.biesheuvel at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63304

--- Comment #48 from ard.biesheuvel at linaro dot org ---
(In reply to Richard Earnshaw from comment #47)
> (In reply to ard.biesheuvel from comment #46)
> > One issue that this causes, which I did not see mentioned anywhere in the
> > thread, is that the use of adrp/add and adrp/ldr imposes a 4 KB section
> > alignment. In EDK2 Tianocore (UEFI reference implementation), we
> > deliberately use -mcmodel=large to get around this requirement, since code
> > size is a big deal when executing from NOR flash, and the architecture of
> > EDK2 (lots and lots of small separately linked binaries) makes
> > the overhead of 4 KB section alignment prohibitive. (It uses 32 byte section
> > alignment unless there are objects like a vector table that require more)
> 
> Huh?  It imposes a 4k *SEGMENT* alignment.  It doesn't impose a section
> alignment.

Indeed, apologies for mixing up the lingo.

But my point is that -mcmodel=large did not use to impose such a minimum
alignment, and with this change, it now does. Would it perhaps make sense to
default enable this feature only for -mcmodel=small (which already uses
adrp/add anyway)