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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Scumbria who wrote (95655)	2/28/2000 2:09:00 PM
From: Tenchusatsu	Respond to of 1573430

Scumbria, <The fact is that this isn't an extremely common case. The ALU only handles logical ops, shifts, and 32 bit adds. It does not handle multiplies or divides. Also, compilers will insert non-dependent instructions between dependencies wherever possible to avoid such stalls.> Yet you have to admit that compilers have a tough time keeping a 3-way superscalar integer unit filled, much less a 4-way. A double-pumped 2-way unit will be able to execute more instructions per (main) clock than a conventional 4-way unit. And the compiler won't have to go out of its way to fill up all four slots. On the other hand, I can't argue with you concerning the low frequency of RAW hazards between two simple arithmetic instructions. Tenchusatsu