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Re: Fix PR rtl-optimization/28243
> So the combination used the REG_EQUAL note attached to insn 83? If so,
> this looks very similar to PR rtl-optimization/25514 (itself fixed by
> PR rtl-optimization/27736), which is only on mainline at the moment.
Yes, it does.
> You only mention 4.1 in your message above so I just wanted to check
> that whether or not this is a separate problem, or whether a backport
> of 25514/27736 would have worked.
I think it's a sub-problem of yours and that my patch is relatively safe.
I must admit that I haven't fully understood your solution but, if the
consensus is that it can eventually be backported to the 4.1 branch, my patch
should probably be backed out.