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Subject: [Bug target/104117] [9,10,11,12 Regression] Darwin ppc64 uses
 invalid non-PIC address to access constants (in PIC code).
Date: Fri, 11 Feb 2022 23:52:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104117

--- Comment #23 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Iain D Sandoe <iains@gcc.gnu.org>:

https://gcc.gnu.org/g:4c3792d448964f7bd99e7eac2c29c9eb7c2bfb84

commit r12-7209-g4c3792d448964f7bd99e7eac2c29c9eb7c2bfb84
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon Feb 7 15:36:35 2022 +0000

    LRA, rs6000, Darwin: Amend lo_sum use for forced constants [PR104117].

    Two issues resulted in this PR, which manifests when we force a constant
into
    memory in LRA (in PIC code on Darwin).  The presence of such forced
constants
    is quite dependent on other RTL optimisations, and it is easy for the i=
ssue
to
    become latent for a specific case.

    First, in the Darwin-specific rs6000 backend code, we were not being
careful
    enough in rejecting invalid symbolic addresses.  Specifically, when
generating
    PIC code, we require a SYMBOL_REF to be wrapped in an
UNSPEC_MACHOPIC_OFFSET.

    Second, LRA was attempting to load a register using an invalid lo_sum
address.

    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    Co-authored-by: Vladimir Makarov <vmakarov@redhat.com>

            PR target/104117

    gcc/ChangeLog:

            * config/rs6000/rs6000.cc
(darwin_rs6000_legitimate_lo_sum_const_p):
            Check for UNSPEC_MACHOPIC_OFFSET wrappers on symbolic addresses
when
            emitting PIC code.
            (legitimate_lo_sum_address_p): Likewise.
            * lra-constraints.cc (process_address_1): Do not attempt to emi=
t a
reg
            load from an invalid lo_sum address.=