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From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Fredrik Noring <noring@nocrew.org>
Cc: "Philippe Mathieu-Daudé" <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>,
	"Jürgen Urban" <JuergenUrban@gmx.de>,
	qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v5 6/8] target/mips: Define the R5900 CPU
Date: Sun, 21 Oct 2018 16:21:45 +0100 (BST)	[thread overview]
Message-ID: <alpine.LFD.2.21.1810211526230.19280@eddie.linux-mips.org> (raw)
In-Reply-To: <20181021123423.GA2666@sx9>

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

      reply	other threads:[~2018-10-21 15:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1537379317.git.noring@nocrew.org>
     [not found] ` <b4a7f8e59ba8f6eaa03e7fe24690df7b39b17e8d.1537379317.git.noring@nocrew.org>
     [not found]   ` <f299b045-eac4-9dec-3999-627d9984141f@amsat.org>
     [not found]     ` <alpine.LFD.2.21.1809210020490.19067@eddie.linux-mips.org>
2018-10-21 12:34       ` [Qemu-devel] [PATCH v5 6/8] target/mips: Define the R5900 CPU Fredrik Noring
2018-10-21 15:21         ` Maciej W. Rozycki [this message]

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