need MIPS expert help

need MIPS expert help

[Sean McNeil]

Hello all,

I need help in clarification of what an NEC MIPS vr5432 should be
defined as.  I had thought that it was a MIPS32 compliant part, but
binutils/gcc think that it can support a few instructions that it cannot
(as MIPS32):

mul	d,v,t
madd	s,t

I am thinking these are supported in MIPS32R2, not MIPS32 ISA.  These
might not be the only instructions that are giving me problems, but so
far are the two that I've encountered.

Is there a MIPS expert out there who can clarify this?  GCC uses a
definition ISA_HAS_MADD_MSUB that includes both MIPS32 and MIPS32R2 and
mips-opc.c defines both instructions above as part of I32, not I33.

Any and all help is appreciated.

Thanks,
Sean

Re: need MIPS expert help

[Steven J. Hill]

Sean McNeil wrote:
> 
> I need help in clarification of what an NEC MIPS vr5432 should be
> defined as.  I had thought that it was a MIPS32 compliant part, but
> binutils/gcc think that it can support a few instructions that it cannot
> (as MIPS32):
> 
The NEC VR5432 is NOT an MIPS32 compliant part. It was produced before
MIPS came out with the MIPS32 and MIPS64 cores. You should be using
the '-mcpu=r5000' and '-mips2' flags to gcc. Please read the kernel
sources next time. Cheers.

-Steve

Re: need MIPS expert help

[Eric Christopher]

On Sat, 2003-03-08 at 20:39, Sean McNeil wrote:
> Hello all,
> 
> I need help in clarification of what an NEC MIPS vr5432 should be
> defined as.  I had thought that it was a MIPS32 compliant part, but

It is a mips4 part following the old published ISAs, not MIPS32(tm) or
MIPS32r2.

-eric

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