RE: Intel and Microsoft provide higher 32-bit applications performance on Itanium
From: Tom Linden (tom_at_kednos.com)
Date: 01/31/04
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Date: Sat, 31 Jan 2004 05:25:35 -0800
-----Original Message-----
From: Bill Todd [mailto:billtodd@metrocast.net]
Sent: Friday, January 30, 2004 10:11 PM
To: Info-VAX@Mvb.Saic.Com
Subject: Re: Intel and Microsoft provide higher 32-bit applications
performance on Itanium
"JF Mezei" <jfmezei.spamnot@istop.com> wrote in message
news:401ACDA2.9BD6FEE@istop.com...
> > applications will be carried out in software. At run time, the IA-32
> > Execution Layer software translates the IA-32 application code into
> > native Itanium architecture code and allows it to run as
native code.
>
> Considering that half the IA64 architecture resides in the EPIC
compilers,
is
> it fair to state that any code compiled on and for 8086 would
not be able
take
> advantage of any of the fancy performance stuff of IA64 since
there would
be
> no explicit parralelism built into the code ?
Actually, a software mechanism (akin to FX!32) *can* probably mung what it
interprets from the x86 binary code to take more advantage of
EPIC features
(such as they are) than the current hardware emulation can. That
may be one
of the reasons it's faster, for that matter.
IIRC FX!32 had a profiling-like facility which could massage the
munged code
based on execution characteristics. Now, I think that I vaguely remember
that the new Itanic software emulator doesn't produce a permanent native
binary (to keep with the x86 binary), but I also seem to remember that it
*may* still improve the native binary as it executes. Oh, hell - someone
who actually knows something about all this would be a much
better source of
information than I am: anyone? Anyone?
Actually, FX!32 cosisted of two parts, the emulator and the optimizer. The
latter actually symthesized an acyclic graph of the program and subsequently
ran a flow analysis, which could be scheduled to run successively to produce
better native alpha code. Of course, you really can't buils a symbol tree
brom this to do, e.g., liftime analysis but it was still pretty impressive.
- bill
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