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Sender: "Maciej W. Rozycki" <macro@linux-mips.org>
From: "Maciej W. Rozycki" <macro@linux-mips.org>
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Subject: Re: [Qemu-devel] [PATCH v5 6/8] target/mips: Define the R5900 CPU
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To: Fredrik Noring <noring@nocrew.org>
Cc: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= <f4bug@amsat.org>, Richard Henderson <richard.henderson@linaro.org>, Aleksandar Markovic <amarkovic@wavecomp.com>, Aurelien Jarno <aurelien@aurel32.net>, Petar Jovanovic <pjovanovic@wavecomp.com>, Peter Maydell <peter.maydell@linaro.org>, =?UTF-8?Q?J=C3=BCrgen_Urban?= <JuergenUrban@gmx.de>, qemu-devel@nongnu.org

Hi Fredrik,

> >  The C790 is a follow-up to the R5900.  The R5900 has an FPU that is not 
> > compliant to the IEEE 754 standard for floating-point arithmetic.  It 
> > doesn't implement exceptions, infinities, NaNs or denormals.  It doesn't 
> > implement the the double format either, but that is really tangential, 
> > because the same was the case with the IDT R4650, which had a standard 
> > IEEE 754 FPU, but no double format either.  Finally it has some anomalies 
> > in the FP instruction set; not all opcode encodings are standard.
> 
> Do you know where one might find a list of the nonstandard FP instructions?
> 
> The command
> 
> % grep 'FP_.*EE' binutils/opcodes/mips-opc.c
> 
> gives a list of candidates, I suppose?

 Yeah, those that have EE in `membership' are extra and those that have EE 
in `exclusions' are missing.

 See also: <https://sourceware.org/ml/binutils/2012-11/msg00360.html>.

  Maciej