0001754: Optimisation

ID	Project	Category	View Status	Date Submitted	Last Update

0001754	DCP-o-matic	Features	public	2020-06-02 20:53	2022-01-16 20:59

Reporter	carl	Assigned To	carl
Priority	normal	Severity	minor	Reproducibility	have not tried
Status	acknowledged	Resolution	open

Summary	0001754: Optimisation
Description	A general catch-all for optimisation thoughts/to-dos `opj_int_fix_mul` is called a lot and the `assert()s` seem to show up in the profile, strangely; is it being inlined? `mct_encode_real` looks like a candidate for SSE, although it's doing fixed point which isn't ideal. See how far the fixed point stuff goes back as it's probably quicker to do it in floating point with SSE; `grep fix_mul` suggests `dwt.c`, `t1.c`, `mct.c`. A callgrind on 2.15.76 suggests that of the J2K encode it's 52% `dwt_encode`, 29% `t1_encode` and 9% `mct_encode`. Some CI-ish benchmarking would be nice. Maybe `ccheck` can be resurrected for this.
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Branch
Estimated weeks required
Estimated work required	Undecided

Date Modified	Username	Field	Change
2020-06-02 20:53	carl	New Issue
2020-06-02 20:55	carl	Description Updated
2020-06-02 20:55	carl	Estimated work required	=> Undecided
2020-06-02 20:57	carl	Description Updated
2020-06-02 21:03	carl	Description Updated
2020-06-02 22:50	carl	Description Updated
2020-06-03 00:12	carl	Description Updated
2020-06-03 00:12	carl	Description Updated
2022-01-16 20:59	carl	Assigned To	=> carl
2022-01-16 20:59	carl	Status	new => acknowledged