Linked by Thom Holwerda on Thu 18th Aug 2005 16:46 UTC, submitted by Nicholas Blachford
Intel "At next week's Intel developer forum, the firm is due to announce a next generation x86 processor core. The current speculation is this new core is going too be based on one of the existing Pentium M cores. I think it's going to be something completely different."
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rayiner
Member since:
2005-07-06

Ha ha, I think I lied about the 16-bit thing. The P4 had 16-bit "fast" ALUs (it handled a 32-bit operation in two cycles). They ran at 2x the clockspeed, so they were like 2 regular 32-bit ALUs. But I just realized that no 64-bit P4 ever came out. The Prescott (P5?) has 2 32-bit ALUs. They can handle 32-bit operations in 1 clock cycle (but with some limitations that mitigate much of their advantage), but still handle 64-bit ops in multiple clock cycles. The "slow" ALU and the AGUs are all 64-bit.

Intel's basic problem WRT 64-bit support is that they've got the double-speed ALUs. Just getting those ALUs to 32-bits was a pretty trick of engineering. They weren't in a position to just make then 64-bits wide to support x86_64 code.

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