Re: Continuations

On Wed, 17 Jul 2024 23:17:37 +0000
mitchalsup@aol.com (MitchAlsup1) wrote:

 
A really BIG implementation with 4 FMAC units per core could unroll
the loop (by reservation stations) such that each iteration would
still be 44-cycles, but you could run 4 in parallel and achieve 4
results every 44-cycles--which to most people smells like 1 result
every 11-cycles.
 
{Would be an interesting reservation station design, though}

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Your "really BIG" implementation sound not so big by modern standards.
I think, all x86 cores sold in last 5 years except those that are called
"small" or "economical" have at least 8 FMAC units. The last
mainstream x86 core with 4 FMAC was AMD Zen1.
On the ARM side "mainstream" Cortex-A cores still feature 4 FMAC units,
but "premium" Cortex-X cores have more. So do "performance" cores from
Apple and Qualcomm.