https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881
--- Comment #48 from Uroš Bizjak <ubizjak at gmail dot com> --- Comment on attachment 59315 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59315 Candidate patch >+static rtx >+ix86_tls_index (void) >+{ >+ if (!ix86_tls_index_symbol) >+ ix86_tls_index_symbol = gen_rtx_SYMBOL_REF (Pmode, "_tls_index"); >+ >+ if (flag_pic) >+ { >+ rtx unspec = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, >ix86_tls_index_symbol), >+ UNSPEC_PCREL); >+ return gen_rtx_CONST (Pmode, unspec); Please note that RIP-relative addresses are one byte shorter than absolute addresses and are interchangeable on x86_64 Linux. If this is also true on Windows (UNSPEC_PCREL was introduced for PE linkers) then the above should also be emitted without flag_pic. Looking through the i386.cc, there are some (flag_pic) asserts w/ UNSPEC_PCREL), but perhaps these can be relaxed to also support RIP-relative addresses without -fPIC.
