RFA: MIPS paired single support

[Richard Sandiford]

Nigel Stephens <nigel@mips.com> writes:
> Richard Sandiford wrote:
>>> 1. Change the target from "mips*-*-*" to "mips*-*-elf", such that
>>> other mips targets won't fail.
>>
>>I'd suggest mipsisa64*-*-* and sb1*-*-* only.  A mips64-elf simulator
>>wouldn't normally understand MIPS3D instructions.
>
> MIPS32 Release 2 does support paired-single and MIPS3D on a 32-bit
> processor, if it is paired with a 64-bit floating-point unit.

I know, but...

> I know GCC doesn't currently support such a combination, but I do have a
> set of patches against gcc-3.4 to enable 64-bit float with 32-bit gprs
> on MIPS32r2, which I should get around to porting across to mainline...

...we certainly shouldn't be adding mipsisa32r2*-*-* to the target list
until this is supported.  I still think mipsisa64*-*-* and sb1*-*-*
is the right choice for the initial check-in.

Richard