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Re: [Qemu-devel] [PATCH 05/18] target-ppc: Add ISA 2.06 divwe[u][o] Inst

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 05/18] target-ppc: Add ISA 2.06 divwe[u][o] Instructions
Date: Tue, 10 Dec 2013 10:30:49 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0

On 12/10/2013 09:58 AM, Tom Musta wrote:
>> > The second test can never be true, since ra has 32 zero bits.
>> > Thus the first test is also pointless.
> Hmm.  Consider the case where GPR[RA] = 0xUUUUUUUU_80000000 (U=don't care) and
> GPR[RB] = 0xUUUUUUUU_FFFFFFFF.  Without these checks, I do not believe 
> overflow
> will be properly detected.

Hmm.  I'm not sure what I was thinking here.  Ignore all that.


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