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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110237] gcc.dg/torture/pr58955-2.c is
 miscompiled by RTL scheduling after reload
Date: Tue, 20 Jun 2023 09:52:32 +0000
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X-Bugzilla-Component: rtl-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110237

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D110309
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-06-20

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
This looks like the same issue as PR110309.  We have

(insn 38 35 39 3 (set (mem:V16SI (plus:DI (reg:DI 40 r12 [orig:90 _22 ] [90=
])
                (const:DI (plus:DI (symbol_ref:DI ("b") [flags 0x2]  <var_d=
ecl
0x7ffff6e28d80 b>)
                        (const_int -4 [0xfffffffffffffffc])))) [1 MEM
<vector(16) int> [(int *)vectp_b.12_28]+0 S64 A32])
        (vec_merge:V16SI (reg:V16SI 20 xmm0 [118])
            (mem:V16SI (plus:DI (reg:DI 40 r12 [orig:90 _22 ] [90])=20
                    (const:DI (plus:DI (symbol_ref:DI ("b") [flags 0x2]=20
<var_decl 0x7ffff6e28d80 b>)
                            (const_int -4 [0xfffffffffffffffc])))) [1 MEM
<vector(16) int> [(int *)vectp_b.12_28]+0 S64 A32])

so instead of a masked load we see a vec_merge with a (mem:V16SI ...)
based on the vectp_b.12_28 pointer that has full size but the load of b[1]
we try disambiguate against refers to int b[10] which is too small for
a load of 64 bytes so we disambiguate based on that.

So quite likely a duplicate.=