Date: Wed, 10 Jan 2018 13:29:33 -0700 From: Warner Losh <imp@bsdimp.com> To: John Baldwin <jhb@freebsd.org> Cc: "freebsd-mips@freebsd.org" <mips@freebsd.org> Subject: Re: Switch to hard-float by default? Message-ID: <CANCZdfp=82mpjO3C3L_RXrPa66nouFfgpKxtzezxoe1S2RzCzQ@mail.gmail.com> In-Reply-To: <2059726.KWgedH7NrU@ralph.baldwin.cx> References: <2059726.KWgedH7NrU@ralph.baldwin.cx>
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On Wed, Jan 10, 2018 at 12:54 PM, John Baldwin <jhb@freebsd.org> wrote: > I have been working on LLVM libunwind patches for MIPS and the last round > has > been to teach the unwinder to handle hard-float. As part of this I just > fixed > a bug which had broken HF support for N32 (in review now), and I have a > working 'mipsn32hf' world that boots under qemu. However, if I add > 'mipsn32hf' to the list of known targets that is yet another world to add > to make universe. I wonder if instead we should consider switching MIPS to > assume hard-float by default? We made that change for 32-bit arm recently. > > The simplest approach would be to add 'mipsn32hf' and then remove all the > non '*hf' targets from Makefile.inc1 (if we only wanted to support HF). A > more drastic approach would be to change the existing 'mips*' targets to > assume hard-float, remove all the '*hf' targets (which are only in 12 > anyway > I think?) and add in explicit '*sf' targets if anyone has a need for them. > Given that none of the *hf targets have been MFC'd are only present in 12 > anyway, maybe the more drastic route is actually better? If we do go that > route, does anyone have a use case for a '*sf' target? That is, is anyone > running FreeBSD/mips on a processor that does not include an FPA? > I think that I retired the last set of SoCs that only had soft float. I think this is a good idea. The only use case I can think of is if I'm wrong and some of the early Atheros SoCs can do soft float. But then we'd just have one supported soft-float platform to worry about rather than the full generality we have now. Warner
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