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Re: PC-relative TLS support
On Thu, Aug 15, 2019 at 01:35:10PM +0930, Alan Modra wrote:
> Supporting TLS for -mpcrel turns out to be relatively simple, in part
> due to deciding that !TARGET_TLS_MARKERS with -mpcrel is silly. No
> assembler that I know of supporting prefix insns lacks TLS marker
Will this stay that way? (Or do we not care, not now anyway?)
> Also, at some point powerpc gcc ought to remove
> !TARGET_TLS_MARKERS generally and simplify all the occurrences of
> IS_NOMARK_TLSGETADDR in rs6000.md rather than complicating them.
The last time this came up (a year ago) the conclusion was that we first
would have to remove AIX support.
> * config/rs6000/predicates.md (unspec_tls): Allow const0_rtx for got
> element of unspec vec.
> * config/rs6000/rs6000.c (rs6000_option_override_internal): Disable
> -mpcrel if -mno-tls-markers.
> (rs6000_legitimize_tls_address): Support PC-relative TLS.
> * config/rs6000/rs6000.md (UNSPEC_TLSTLS_PCREL): New unspec.
> (tls_gd_pcrel, tls_ld_pcrel): New insns.
> (tls_dtprel, tls_tprel): Set attr prefixed when tls_size is not 16.
> (tls_got_tprel_pcrel, tls_tls_pcrel): New insns.
(Changelog has whitespace damage, I guess that is just from how you
mailed this? Please fix when applying it).
The patch is fine when its prerequisites are in. Thanks,