https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109166
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WONTFIX
Status|NEW |RESOLVED
--- Comment #8 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
I'm going to close this as WONTFIX.
There are several reasons for this.
There's no SWPH operation, so it's impossible to generalize atomic operations
for all basic data types. It's not possible to synthesize a 16-bit atomic type
with either SWP or SWPB.
There's no support in Thumb state for SWP[B].
The instruction was removed in later versions of the architecture, which makes
code non-portable.
Finally, Armv4, which dates to around 1995, is essentially in maintenance only
mode and this is really a new feature request. In fact, I don't think we'd
really want to add new features for anything before Armv7 these days (even that
is more than 10 years old).
