Apple Job Posting and Good News for LinuxPPC developers
paubert at iram.es
Fri Mar 26 22:31:59 EST 1999
> My group at IBM Research also is looking for someone with operating
> system development experience to join our project:
> The project is targeted at multiprocessor systems utilizing 64-bit processors
> including PowerPC64. An additional aspect is compatibility with glibc.
Do 64 bit PPC processors that can be bought as chips (not in a system)
exist (i.e., can you buy a Power3 in a BGA package and the chipset that
goes with) ?
Not many people have seen a 620 AFAICT :-( and the G4 I've seen announced
by Motorola is not what I expected: it's a super 750 with Altivec + 604
FPU (single cycle double precision multiplier) + SMP capabilities.
But at least I expected:
- a 64 bit version (means >32 address pins, perhaps ~40 or so, 64 is
obviously overkill right now and I don't ask for it)
- more superscalar (not 2+branch, but at least 4 way)
- longer in flight instruction queue
- 2 FPU: not sure, but divides seem to kill current PPC, one
unit which can do all instructions(including sqrt) + one mult/add only
would be great. OTOH, on FFT benchmarks which interest me also (not a
single div), PPC are excellent.
- 2 LSU to feed all these units: hey Pentium and PPro can do 2 memory
accesses por clock since they came out. They need it because they
require many load/store to compensate for the small number of registers
but I'd expect it to be beneficial even on PPC with large and fast
backside L2 caches. Power2 has had 2 LSU since the beginning AFAICT.
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