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Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: TechieGuy-alt who wrote (19787)	11/20/2000 11:38:13 AM
From: Cirruslvr	Read Replies (1) \| Respond to of 275872

I thought this was the best description of the P4's FPU - "It’s clear the FPU of the Pentium 4 is there for backwards compatibility .. " From the review at Ace's Hardware. ;)

To: TechieGuy-alt who wrote (19787)	11/20/2000 11:38:55 AM
From: jcholewa	Respond to of 275872

'kay, 'kay, fine. Maybe I retract that statement. I got in trouble for saying it in some other thread, too. #_#

To: TechieGuy-alt who wrote (19787)	11/20/2000 2:30:27 PM
From: muzosi	Read Replies (2) \| Respond to of 275872

bitwise rotate left is (was ?) the usual way to do multiplies by any factor of 2. Additionally, any bitwise masking operations (like reading a bit from a port- very usual in embedded programming at least) is handled with the same instruction. You OR the new bit in the LSb and rotate left to make room for the next one. although I don't agree with JC on this issue, I can't say your reasons are good either. I think you're talking about Shift Left NOT Rotate Left. Rotate makes a copy of the MSB, does a Shift and puts the copy of MSB into LSB. It does a circular (sp?) move on the variable, i.e. "rotate". It can't be used for either purpose you mention. But it is useful in accelerating internet/encryption protocol management. Muzo