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Jim Granville
04/07/15 16:35
Read: 828 times


 
#190460 - 'creativity'
Responding to: Andy Neil's previous message
Andy Neil said:
Note that the full quote is, "the DQ8051 Dhrystone score rates at 29.01x the original at the same frequency"
..

Yes, there is some 'creativity' involved as I see their IP has many extensions, of Multiple DPTR with Auto-INC and Auto-Switch, and they also mention MDU32 and even floating point - but they omit to show any opcode timings, or show the impact of the quad-pipeline on JUMPS.
Usually the more you pipeline, the worse branches get, and I've yet to see a 8051 core design that is properly clever in handling
JNB SFR.Bit,$

which could be coded to be 1 cycle granular, after the 3 byte fetch.

List of 11 messages in thread
TopicAuthorDate
"New 8051 IP core is 29X faster than original"      Andy Neil      04/01/15 01:18      
   if this is not gobbelygook, then      Erik Malund      04/01/15 07:01      
      That's benchmark scores for you      Andy Neil      04/01/15 10:35      
         'creativity'      Jim Granville      04/07/15 16:35      
            26.85x      Jan Waclawek      04/13/15 12:39      
      Maybe I don't understand their claim ...       Richard Erlacher      04/02/15 19:18      
   How about the power?      Oliver Sedlacek      04/17/15 04:44      
   From DCD's DQ8051 product page..      Valentin Angelovski      04/19/15 06:51      
      VAX MIPS      Andy Neil      05/14/15 13:18      
         MIPS      Michael Karas      05/18/15 14:18      
            order of magnitude      Andy Neil      05/20/15 09:31      

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