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Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
> The last time this came up, it was pretty much agreed that the main
> reason to still have libcalls was to allow dynamic TLS addresses
> (which involve calls) to be CSE-ed. I don't know if this actually
> works as expected right now, I've never checked that.
I'd expect this to be very similar, if not identical, to a call to
something like _muldi3. Why isn't it?