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From: "fxcoudert 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: Sat, 19 Aug 2023 09:27:41 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: ice-checking, ice-on-valid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107876

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fxcoudert at gcc dot gnu.o=
rg

--- Comment #7 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> =
---
The test case (g++.dg/tree-ssa/pr107876.C) fails on aarch64-darwin.

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"

The output says:

;; Function test17 (_Z6test17i, funcdef_no=3D0, decl_uid=3D4194, cgraph_uid=
=3D1,
symbol_order=3D0)

Estimating # of iterations of loop 1
g++.dg/tree-ssa/pr107876.C:21:7: optimized: unswitching loop 1 on 'if' with
condition: i_7(D) =3D=3D 0
g++.dg/tree-ssa/pr107876.C:21:7: note: optimized sizes estimated to 0 (true)
and 0 (false) from original size 16=