[PATCH RFC] MIPS add support for MIPS SIMD ARCHITECTURE V1.07

Joseph S. Myers joseph@codesourcery.com
Tue Jan 21 21:17:00 GMT 2014


On Tue, 21 Jan 2014, Richard Sandiford wrote:

> And as you imply, o32+fp64 is already an established ABI so I think we
> have to support the current form alongside any new one.  I agree with
> Joseph that it'd be better to realign the stack dynamically instead.
> This is what x86 does, so it's well tested within gcc.

With glibc, o32+fp64 is not established - the glibc patch submitted in 
November needs more work as I noted in my review, likely to include 
dynamic linker names distinct from those used for o32+fp32.  So it would 
be possible to declare that only a new form is supported with glibc (more 
generally, with the Linux kernel, given the lack of current kernel support 
for o32+fp64 stated in the glibc discussion), with appropriate configure 
checks preventing building glibc with an old-ABI o32+fp64 compiler (and 
ideally a #error in some glibc header disallowing building programs with 
an old-ABI o32+fp64 compiler).

-- 
Joseph S. Myers
joseph@codesourcery.com



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