Re: Intel vs AMD x86-64

[H. Peter Anvin]

Followup to:  <403CCBE0.7050100@xxxxxxxxxxxxxx>
By author:    Timothy Miller <miller@xxxxxxxxxxxxxx>
In newsgroup: linux.dev.kernel
>
> 
> Nakajima, Jun wrote:
> > No, it's not a problem. Branches with 16-bit operand size are not useful
> > for compilers.
> 
>  From AMD's documentation, I got the impression that 66H caused near 
> branches to be 32 bits in long mode (default is 64).
> 
> So, Intel makes it 16 bits, and AMD makes it 32 bits?
> 
> Either way, I don't see much use for either one.
> 

Both claims are pretty bogus.  Shorter branches are quite nice for
intraprocedural jumps; it reduces the cache footprint.

	-hpa

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