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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107876] [13 Regression] ICE in
 verify_dominators, at dominance.cc:1184 (error: dominator of 4 should be 14,
 not 16) since r13-3749-g7314b98b1bcd382c
Date: Fri, 01 Sep 2023 21:43:46 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-checking, ice-on-valid-code, testsuite-fail
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X-Bugzilla-Who: egallager at gcc dot gnu.org
X-Bugzilla-Status: REOPENED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107876

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
           Keywords|                            |testsuite-fail
                 CC|                            |egallager at gcc dot gnu.o=
rg
             Status|RESOLVED                    |REOPENED

--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Francois-Xavier Coudert from comment #7)
> The test case (g++.dg/tree-ssa/pr107876.C) fails on aarch64-darwin.
>=20
> FAIL: g++.dg/tree-ssa/pr107876.C  -std=3Dgnu++14  scan-tree-dump unswitch
> "unswitching loop 1 on .switch. with condition: i_[0-9]+\\(D\\) =3D=3D 2"
> FAIL: g++.dg/tree-ssa/pr107876.C  -std=3Dgnu++17  scan-tree-dump unswitch
> "unswitching loop 1 on .switch. with condition: i_[0-9]+\\(D\\) =3D=3D 2"
> FAIL: g++.dg/tree-ssa/pr107876.C  -std=3Dgnu++20  scan-tree-dump unswitch
> "unswitching loop 1 on .switch. with condition: i_[0-9]+\\(D\\) =3D=3D 2"
>=20
> The output says:
>=20
> ;; Function test17 (_Z6test17i, funcdef_no=3D0, decl_uid=3D4194, cgraph_u=
id=3D1,
> symbol_order=3D0)
>=20
> Estimating # of iterations of loop 1
> g++.dg/tree-ssa/pr107876.C:21:7: optimized: unswitching loop 1 on 'if' wi=
th
> condition: i_7(D) =3D=3D 0
> g++.dg/tree-ssa/pr107876.C:21:7: note: optimized sizes estimated to 0 (tr=
ue)
> and 0 (false) from original size 16

reopening, then=