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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101925] [10/11/12 Regression] reversed
 storage order when compiling with -O3 only since r10-4742-g9b75f56d4b7951c6
Date: Mon, 16 Aug 2021 12:20:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101925

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Disabling SRA fixes it also, and I think that SRA drops the rev storage o=
rder
> access attribute.  Oddly enough for be_ip6_addr I see the rc.u.addr8[]
> accesses do _not_ result in reverse_storage_order_for_component_p being t=
rue.
> Why's that so?  How should I detect this is subject to re-ordering?

Because semantically this does not change anything, but I agree that the fl=
ag
should be set in this case too for the sake of the optimizer.  Please remove
the test on QImode on line 8844 in c/c-decl.c.=