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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113255] [11/12/13/14 Regression] wrong code with -O2
 -mtune=k8
Date: Sun, 07 Jan 2024 19:48:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113255

--- Comment #3 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
_.dse1 pass is removing the store for some reason, -fno-dse "fixes" the
testcase.

Before _.dse1 pass, we have:

(insn 41 40 46 4 (set (mem/c:SI (plus:DI (reg/f:DI 19 frame)
                (const_int -36 [0xffffffffffffffdc])) [2 e[1].y+0 S4 A32])
        (reg:SI 98 [ e$1$y ])) "pr113255.c":21:9 85 {*movsi_internal}
     (expr_list:REG_DEAD (reg:SI 98 [ e$1$y ])
        (nil)))

But _.dse1 pass decides that:

**scanning insn=3D41
  mem: (plus:DI (reg/f:DI 19 frame)
    (const_int -36 [0xffffffffffffffdc]))

   after canon_rtx address: (plus:DI (reg/f:DI 19 frame)
    (const_int -36 [0xffffffffffffffdc]))
  gid=3D1 offset=3D-36
 processing const base store gid=3D1[-36..-32)
mems_found =3D 1, cannot_delete =3D false

...

Locally deleting insn 41
deferring deletion of insn with uid =3D 41.=