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From: "cel at us dot ibm.com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/29247] [gdb, tdep] ../../gdb/ppc-sysv-tdep.c:1945:
 internal-error: ppc64_sysv_abi_return_value: Assertion `ok' failed
Date: Fri, 15 Jul 2022 15:32:43 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29247

--- Comment #21 from Carl E Love <cel at us dot ibm.com> ---
Patch approved, committed.

commit ebbac1687d0075c8666b25438fc4f35d3dd1daaa (HEAD -> master, origin/mas=
ter,
origin/HEAD)
Author: Carl Love <cel@us.ibm.com>
Date:   Fri Jul 15 15:30:43 2022 +0000

    PowerPC: Add support for IEEE 128-bit format.

    The test gdb.base/infcall-nested-structs-c.exp fails on a gdb assert
    in function ppc64_sysv_abi_return_value in file gdb/ppc-sysv-tdep.c.  T=
he
    assert is due to the missing IEEE 128-bit support in file
    gdb/ppc-sysv-tdep.c.

    The IBM long double was the initial float 128-bit support added by IBM
    The IEEE 128-bit support, which is similar IBM long double support, was
    made the default starting with GCC 12.  The floating point format
    differences include the number of bits used to encode the exponent
    and significand.  Also, IBM long double values are passed in a pair of
    floating point registers.  The  IEEE 128-bit value is passed in a single
    vector register.

    This patch fixes the gdb_assert (ok); in function
    ppc64_sysv_abi_return_value in gdb/ppc-sysv-tdep.c by adding IEEE FLOAT
    128-bit type support for PowerPC.

    The patch has been tested on Power 10, ELFv2.  It fixes the following l=
ist
    of regression failures on Power 10:

    gdb.base/infcall-nested-structs-c.exp      192
    gdb.base/infcall-nested-structs-c++.exp     76
    gdb.base/structs.exp                         9

    The patch has been tested on Power 8 BE which is ELFv1.

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