Re: SAR implementation in Bochs

I feel safe with the current code.

Yes, in theory it is implementation dependent but in practice I've never
seen any implementation which does it wrong way and not doing an arithmetic
shift right when the left operand is signed.

Bochs has current code for years and was compiled probably for every
possible platform using various compilers and nobody complained till now.

Doing it "safe" way would be also much slower.

 

Stanislav

 

From: [email protected] [mailto:[email protected]] 
Sent: Thursday, December 18, 2014 6:09 PM
To: [email protected]
Subject: SAR implementation in Bochs

 

Hello,

It seems that the SAR instruction implementation in Bochs is kind of
dangerous, as doing a bitshift on a negative value is implementation
dependant, it might not end up the same on all platforms. I think the worst
thing that can happen is an off-by-one error in the result, but that is
enough to break programs...

Please correct me if I'm wrong!

*	Olav

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