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Re: [Qemu-devel] [PATCH] fix fdiv instruction

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH] fix fdiv instruction
Date: Sun, 24 Jun 2018 11:30:36 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 06/24/2018 06:46 AM, Programmingkid wrote:
>> Even in your referenced PDF, table 3-13, it says that frD is unmodified.
> Actually it says when FPSCR[ZE] is set is when frD is unmodified. When 
> FPSCR[ZE] is not set it frD's sign is determined by an XOR of the signs of 
> the operands. I have verified that this is what happens on real PowerPC 750 
> and 950 CPUs. 

Of course.  When ZE is not set, 1 / 0 -> inf (and -1 / 0 -> -inf, etc).
But ZE not set is not the topic of discussion, or the subject of your patch.

> I was just wondering are you able to run a PowerPC operating system in QEMU
> in KVM mode on this Power7 computer?

Sadly not.  KVM is not enabled in this setup.


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