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Re: Virtual Memory
Date: 6/27/14 7:34 pm
In Response To: Virtual Memory (kornman00)

: The 360 has a 64-bit CPU, but it runs in 32-bit mode (so no 64-bit
: instructions). Not sure about the PS3.

Fun bit of history there. The CELL processor was a project kicked off by Sony, IBM, and Toshiba in 2000. It was a "forward"-looking heterogeneous computing design, in which one kinda-sorta-general-purpose "PPE" core manages a number of extraordinarily computationally-focused "SPE" cores. You might notice that Xenon's cores are also sometimes referred to as "PPEs"; this is because, when Microsoft approached IBM years later with their requirements for a next-gen console CPU, IBM decided to use the CELL's PPE as a basis for the cores in a 3-core design for the 360. (Not everyone at Sony was happy that this occurred, lol.)

Anyway, the PS3's CELL has one PPE and seven SPEs (the die has eight, with one shut off for redundancy). The PPE is similar to a Xenon core, with 32-bit instructions and 64-bit data registers, plus some 128-bit SIMD registers. The SPEs also use 32-bit instructions, but all data registers are 128-bit; scalar executions can only handle up to 64-bit precision, and the idea of the large data registers is SIMD.

Messages In This Thread

Life without Reach.Metalingus6276/26/14 9:06 am
     Re: Life without Reach.gamerguy20026/26/14 9:56 am
     Re: Life without Reach.Cody Miller6/26/14 12:39 pm
           Hehe. *NM*Ragashingo6/26/14 1:31 pm
     Just Wait For The Anniversary Editions.Morpheus6/26/14 8:05 pm
           I'll take 12! *NM*Kal6/26/14 9:39 pm
           Re: Just Wait For The Anniversary Editions.General Vagueness6/26/14 10:44 pm
     Disc spacekornman006/26/14 10:30 pm
           I agreeZackDark6/26/14 10:37 pm
                 I meant I agree with everything but that paragraph *NM*ZackDark6/26/14 10:37 pm
                 Map files are memory mappedkornman006/27/14 12:42 am
                       Re: Map files are memory mappeduberfoop6/27/14 12:55 am
                             I'm talking about data containing pointerskornman006/27/14 4:46 am
                                   Re: I'm talking about data containing pointersZackDark6/27/14 11:23 am
                                   Re: I'm talking about data containing pointersGeneral Vagueness6/27/14 12:25 pm
                                         Virtual Memorykornman006/27/14 6:25 pm
                                               Re: Virtual Memoryuberfoop6/27/14 7:34 pm

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