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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108699] gcc.c-torture/execute/builtin-bitops-1.c fails
 on power 9 BE
Date: Tue, 14 Feb 2023 12:12:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108699

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-02-14
                 CC|                            |linkw at gcc dot gnu.org,
                   |                            |meissner at gcc dot gnu.or=
g,
                   |                            |segher at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |linkw at gcc dot gn=
u.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Kewen Lin <linkw at gcc dot gnu.org> ---
Confirmed.

This is due to one latent bug. When specifying -Os, it doesn't try to use
SImode parity any more, but tries to use wider mode TImode parity instead, =
it
resulted in the wrong result.

The current vector parity (including TImode) support is wrong:

;; Vector parity
(define_insn "*p9v_parity<mode>2"
  [(set (match_operand:VParity 0 "register_operand" "=3Dv")
        (parity:VParity (match_operand:VParity 1 "register_operand" "v")))]
  "TARGET_P9_VECTOR"
  "vprtyb<wd> %0,%1"
  [(set_attr "type" "vecsimple")])

The vprtyb[dwq] is for byte parity, it doesn't match the RTL parity semantic
directly.=