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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug testsuite/29816] [gdb/testsuite, powerpc64le] FAIL:
 gdb.ada/float-bits.exp: print 16llf#4000921fb54442d18469898cc51701b8#
Date: Thu, 01 Dec 2022 06:25:09 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29816

--- Comment #11 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D32a5aa262568=
6a709b22db19300a578d96285dd1

commit 32a5aa2625686a709b22db19300a578d96285dd1
Author: Tom de Vries <tdevries@suse.de>
Date:   Thu Dec 1 07:25:04 2022 +0100

    [gdb/testsuite] Fix gdb.ada/float-bits.exp for powerpc64le

    On powerpc64le-linux, I run into:
    ...
    (gdb) print 16llf#4000921fb54442d18469898cc51701b8#^M
    $9 =3D <invalid float value>^M
    (gdb) FAIL: gdb.ada/float-bits.exp: print \
      16llf#4000921fb54442d18469898cc51701b8#
    ...

    The problem is that we're using a hex string for the 128-bit IEEE quad =
long
    double format, but the actual long double float format is:
    ...
    gdbarch_dump: long_double_format =3D floatformat_ibm_long_double_little=
^M
    ...

    Fix this by using the hex string obtained by compiling test.c:
    ...
    long double a =3D 5.0e+25L;
    ...
    like so:
    ...
    $ gcc -mlittle test.c -c -g
    ...
    and running gdb:
    ...
    $ gdb -q -batch test.o -ex "p /x a"
    $1 =3D 0xc1e1c000000000004544adf4b7320335
    ...
    and likewise for -mbig:
    ...
    $ gdb -q -batch test.o -ex "p /x a"
    $1 =3D 0x4544adf4b7320335c1e1c00000000000
    ...

    Tested on powerpc64le-linux.

    I excercised the case of floatformat_ibm_long_double_big by
    using "set endian big" in the test-case.

    Note that for this patch to work correctly, recent commit aaa79cd62b8
("[gdb]
    Improve printing of float formats") is required.

    PR testsuite/29816
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D29816
    Approved-By: Tom Tromey <tom@tromey.com>

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