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Re: [Qemu-devel] [PATCH v5 6/8] target/mips: Define the R5900 CPU
From: |
Fredrik Noring |
Subject: |
Re: [Qemu-devel] [PATCH v5 6/8] target/mips: Define the R5900 CPU |
Date: |
Sun, 21 Oct 2018 14:34:23 +0200 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
Hi Maciej,
> 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?
Fredrik
- Re: [Qemu-devel] [PATCH v5 6/8] target/mips: Define the R5900 CPU,
Fredrik Noring <=