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From: "dflogeras2 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106068] Infinite loop generated with -mcpu=cortex-m7 and
 -O2
Date: Thu, 23 Jun 2022 19:53:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106068

--- Comment #2 from Dave Flogeras <dflogeras2 at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> You access an out of bounds for the array dhcp_rx_options_given in the wh=
ile
> statement:
>=20
>   while((dhcp_rx_options_given[8 + n] !=3D 0) && (n < 2)) {
>=20
>=20
> Swap around the two expressions so you check to make sure n is less than 2
> before doing the array access. that is:
>=20
>   while((n < 2) && (dhcp_rx_options_given[8 + n] !=3D 0)) {


For that code, agreed, and that was indeed both our and upstreams workaroun=
d.=20
We were just wondering if it was a legitimate compiler bug given that it
generated an infinite loop in asm.  Or does it just fall under "undefined"=