Date: Wed, 14 Nov 2018 11:10:12 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCH] mips: fix setjmp/longjmp for O32 FP64 ABI On Wed, Nov 14, 2018 at 01:37:16PM +0300, info@...ile-stream.com wrote: > Save/restore six double-precision callee-saved registers as > described in sections 9 and 12.1 at . > > This intentionally touches only the O32 FP64 case (-mfp64 > -modd-spreg) and changes nothing for FP32 (-mfp32), FPXX (-mfpxx) or > FP64A (-mfp64 -mno-odd-spreg). > > The s.d/l.d instruction aliases are not used because > - they are not implemented in llvm/clang before 4.0 at all; > - they do not expand to swc1/lwc1 pairs for e.g. -mips1 with llvm/clang 5.0.1 at least. > >  https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking This patch needs more explanation for consideration. I could probably figure it out from the above link but that's a lot of reading, and a TL;DR would be really helpful here. If the patch to solve an existing problem with some supported ABI or is it adding a new ABI? If the latter, is it mutually compatible for the purposes of calling/linkage? New ABIs can't just be added without both a name and a justification. Rich
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