https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91173
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
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CC| |law at redhat dot com
--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
This is a bug in gen_addr_rtx which doesn't handle the case where the base
address is a constant. We end up using the mode of the constant to generate a
REG, which of course doesn't work because constants are modeless.
I think the fix is as simple as changing a gen_rtx_PLUS to a suitable
simplify_gen_binary. I'll spin that.
The change in copy propagation is just a trigger, AFAICT this has likely been
latent a long time.
