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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/96470] [10/11 regression] gnat.dg/opt39.adb is not
 scalarized
Date: Mon, 28 Sep 2020 15:14:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96470

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu.o=
rg
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-09-28
          Component|testsuite                   |target
             Status|UNCONFIRMED                 |NEW
            Summary|[10 regression]             |[10/11 regression]
                   |gnat.dg/opt39.adb fails     |gnat.dg/opt39.adb is not
                   |since r10-917               |scalarized

--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The difference is:

Rejected (3173): not aggregate: a
Rejected (3174): not aggregate: i
Rejected (3175): not aggregate: aL
Candidate (3180): tmp
Too big to totally scalarize: tmp (UID: 3180)

because max_scalarization_size =3D=3D 128 on PowerPC64 (it's 1088 on x86-64=
) in the
analyze_all_variable_accesses function.  So I can force the test to pass on
PowerPC64 by means of --param=3Dsra-max-scalarization-size-Ospeed=3D32 but =
the
default max_scalarization_size seems to be unduly low on PowerPC64 (just 2
words).=