Messages in this thread | | | Subject | Re: [PATCH] LoongArch: Clean useless vcsr in loongarch_fpu. | From | Xi Ruoyao <> | Date | Mon, 04 Jul 2022 17:58:57 +0800 |
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On Mon, 2022-07-04 at 17:27 +0800, huqi wrote:
> > > The original code was written with future LSX/LASX support in mind; > > the code is dead currently, but expected to get utilized Soon (TM). > > > > So, I'd like to confirm if future LoongArch models would *not* feature > > LSX/LASX in its current form, and that the Loongson Corporation is not > > going to upstream LSX/LASX support, given you are apparently a > > Loongson employee with the first-hand information? We'd like to avoid > > code churn in general, so if the LSX/LASX support is to be eventually > > mainlined, removing them now would only lead to them being introduced > > later. > > `vcsr` is removed because it has been removed in hardware. What's more, > it will not be used to support LSX/LASX in the future.
It would be better to add this information into the commit message. Is it already removed in 3A5000? On my machine "movfcsr2gr $a0, $r16" produces SIGILL (but maybe it's because LSX is not enabled via the EUEN register).
-- Xi Ruoyao <xry111@xry111.site> School of Aerospace Science and Technology, Xidian University
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