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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103037] [11/12 Regression] Wrong code with
 -O2 since r11-6100-gd41b097350d3c5d0
Date: Tue, 02 Nov 2021 07:52:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103037

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #1)
> Confirmed, started with r11-6100-gd41b097350d3c5d0.

Hmm, it is definitely PRE causing the problem:

[changed] ANTIC_IN[7] :=3D { _20 (0014), a_25 (0016), iftmp.0_10 (0008), _29
(0018), {trunc_div_expr,_29,iftmp.0_10} (0004), {nop_expr,_5} (0005),
{plus_expr,a_25,3} (0012) }
S[7] :=3D {  }
Applying pattern match.pd:340, gimple-match.c:16554
ANTIC_OUT[6] :=3D { _20 (0014), iftmp.0_14 (0011), a_25 (0016),
{plus_expr,a_25,3} (0012) }
[changed] ANTIC_IN[6] :=3D { _20 (0014), iftmp.0_14 (0011), a_25 (0016),
{plus_expr,a_25,3} (0012) }
S[6] :=3D { _20 (0014), iftmp.0_14 (0011), a_25 (0016), {plus_expr,a_25,3} =
(0012)
}
Created SSA_NAME representative pretmp_16 for
expression:{trunc_div_expr,_28,_3} (0020)
ANTIC_OUT[5] :=3D { _20 (0014), a_25 (0016), _28 (0017), iftmp.0_15 (0002),
{plus_expr,a_25,3} (0012), {trunc_div_expr,_28,_3} (0020), {nop_expr,pretmp=
_16}
(0021) }
[changed] ANTIC_IN[5] :=3D { _20 (0014), a_25 (0016), _19 (0013), {nop_expr=
,_19}
(0002), _28 (0017), {plus_expr,a_25,3} (0012), {trunc_div_expr,_28,_3} (002=
0),
{nop_expr,pretmp_16} (0021) }
S[5] :=3D { _20 (0014), a_25 (0016), _28 (0017), {plus_expr,a_25,3} (0012),
{trunc_div_expr,_28,_3} (0020), {nop_expr,pretmp_16} (0021) }
Applying pattern match.pd:350, gimple-match.c:8615
ANTIC_OUT[9] :=3D { _20 (0014), a_25 (0016), _19 (0013), {nop_expr,_19} (00=
02),
{plus_expr,a_25,3} (0012) }
[changed] ANTIC_IN[9] :=3D { _20 (0014), a_25 (0016), _19 (0013), {nop_expr=
,_19}
(0002), {plus_expr,a_25,3} (0012) }
S[9] :=3D { _20 (0014), a_25 (0016), _19 (0013), {nop_expr,_19} (0002),
{plus_expr,a_25,3} (0012) }
Applying pattern match.pd:350, gimple-match.c:8615=