- Architosh Staff ([email protected])
- 5 Sep 2002
-
Readers
contribute info on IBM 64-bit PowerPC & G4/G5 AltiVec
IBM Licensed AltiVec Years Ago
Joseph Schneider wrote in to inform us that IBM, at the very
least, licensed AltiVec from Motorola years ago when the two
companies agreed to work together after a brief PowerPC breakup
at their Austin, Texas-based, Design Center. The two companies
discussed their mutual PowerPC plans in a Macworld article
published in 2000 by Stephen Beale. You
can read the article here.
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AltiVec Just A Trademark?
However, according to Juan Gomez Martin of Spain, IBM doesn't
need to license AltiVec at all:
"Concerning your article about IBM's future chip being
Altivec compatible, I believe the only thing proprietary about
Altivec is the trademark, as the vector unit extensions for
PowerPC were named VMX in some roadmap papers before Altivec
first appeared, seeming VMX to be an extension of the common
PPC architecture developed by the AIM group."
We would love it if some reader could help
us confirm that fact, as two other readers have mentioned
VMX as well in their short notes to us.
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ArsTechnica Discussion on VMX and AltiVec
According to Mr. Gomez, there have been some very smart discussions
at Arstechnica.com, in the forums, regarding the AltiVec/VMX
matter. We will be reading those in short order. A couple
of interesting notes which Mr. Gomez included are:
- It is not known if IBM plans to put a full vector unit
(in its upcoming 64-bit PowerPC chip) or some sort of MMX-style
architecture in which vector processing coopts resources
from the rest of the chip (most noticeably the floating-point
units)??
- For an Altivec-style unit to be of any advantage beyond
simple backwards compatibility, it should do double-precision
without workarounds at the very least, or the floating
point units of the Power4-derived architecture will more
than match its capabilities.
What Mr. Gomez may be referring to in the way of workarounds
may be advances made in software to provide higher levels
of floating-point precision in the current G4. Refer to this
story: Apple
discusses Oct-level precision in AltiVec G4 Processor.
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