Rockbox

  • Status Closed
  • Percent Complete
    100%
  • Task Type Patches
  • Category Codecs
  • Assigned To No-one
  • Operating System All players
  • Severity Low
  • Priority Very Low
  • Reported Version Daily build (which?)
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by Buschel - 2008-05-16
Last edited by Buschel - 2008-05-17

FS#9000 - further mpc optimization for PP5020/24 and iaudio m5/x5

1. Use iram for calc_new_V() which is part of the synthesis filter.
2. Minor resorting within calc_new_V() reduces binsize a bit.

Speeds up +3% on PP5022. Effect on coldfire is not measured yet.

Closed by  Buschel
2008-05-17 11:11
Reason for closing:  Accepted
Additional comments about closing:  

committed with r17552

The above patch shouldn't compile for other targets than PP5022/24 or m5/x5 – will be fixed later.
amiconn measured slow down on coldfire through the resorting within calc_new_V(). A new patch for testing on ICODE_ATTR will be placed here soon.

Final version after some test in IRC by amiconn. ICODE_ATTR is set for calc_new_V() for PP5022/24 only. Other targets either haven't enough IRAM or the decoder performance suffers.

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