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From: "cel at us dot ibm.com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29795] New: [gdb, PowerPC] gdb.base/store.exp fails to
 return the correct value
Date: Wed, 16 Nov 2022 19:20:51 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29795

            Bug ID: 29795
           Summary: [gdb, PowerPC] gdb.base/store.exp fails to return the
                    correct value
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: cel at us dot ibm.com
  Target Milestone: ---

The gdb.base/store.exp fails on Power10, with:

gcc (GCC) 12.2.1 20220819 (Red Hat 12.2.1-2)
Fedora release 36 (Thirty Six)

It generates 5 failures:

(gdb) PASS: gdb.base/store.exp: continue to wack_doublest
print l
$29 =3D -1.9375
(gdb) FAIL: gdb.base/store.exp: var doublest l; print old l, expecting -1
print r
$30 =3D 3.20641835417611559822573486476171432e-4938
(gdb) FAIL: gdb.base/store.exp: var doublest l; print old r, expecting -2
set variable l =3D 4

...

print l
$32 =3D 3.999996185302734375
(gdb) FAIL: gdb.base/store.exp: var doublest l; print incremented l, expect=
ing
\
2print l

...

$54 =3D -1.9375
(gdb) FAIL: gdb.base/store.exp: upvar doublest l; print old l, expecting -1
print r
$55 =3D 3.20680779558280486578025331197365593e-4938
(gdb) FAIL: gdb.base/store.exp: upvar doublest l; print old r, expecting -2
set variable l =3D 4

I suspect it has something to do with the "new" default use of IEEE 128-bit
floating point.

NOTE: the test does not fail on Power 10 with:
gcc (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9)
Red Hat Enterprise Linux release 9.0 (Plow)

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