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Optimizing a 6502 image decoder, from 70 minutes to 1 minute

Welcome – colin@colino.net · published 28 September 2025

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https://github.com/colinleroy/qtkn_decoder/commit/ceef883b4528a01658f446f9fde233d8846b98e0
github.com
https://github.com/ncruces/dcraw/blob/8fe4d3825595816ea7d6880d9253f9edd143cacb/dcraw.c
github.com
https://github.com/colinleroy/qtkn_decoder/commit/615ecd7406a65dd43da07443cb5c3f93a8d5fa95
github.com
https://github.com/colinleroy/qtkn_decoder/commit/fd6cd2c44d1cc961f8827ec6b5958521543e6d8d
github.com
https://github.com/colinleroy/qtkn_decoder/commit/73935481468c2a1d20a4640352caed4e47308b54
github.com
https://github.com/colinleroy/qtkn_decoder/commit/75a45d8fdf6943cc26a56c3f53c21f57e2877bbf
github.com
https://github.com/colinleroy/qtkn_decoder/commit/fdad1e8efb45e7597659b6c7d08e0a7714094d59
github.com
https://github.com/colinleroy/qtkn_decoder/commit/b3ac5d70edf0e836aa4b784fc06093d2606f7747
github.com
https://github.com/colinleroy/qtkn_decoder/commit/8b6a1c65011645c810f1a9fbb7d9eb56fe3e702e
github.com
https://github.com/colinleroy/qtkn_decoder/commit/b44aac77d966c292f0762165cdf5b0818a8a0f91
github.com
https://github.com/colinleroy/qtkn_decoder/commit/4142412bda1388b6fadb5d343de07605c1e93ae8
github.com
https://github.com/colinleroy/qtkn_decoder/commit/5161e9e33e5c3f064b0a3c0e5d29e6e7ece4280f
github.com
https://github.com/colinleroy/qtkn_decoder/commit/865ca287f15bfccbca909b464b5939d8c4368f5a
github.com
https://github.com/colinleroy/qtkn_decoder/commit/7112b2b96e3d249f4a65532035dff9a8708bc914
github.com
https://github.com/colinleroy/qtkn_decoder/commit/b0179e034a4396b8b6d09d489608bf0080e7b8d6
github.com
https://github.com/colinleroy/a2tools/blob/master/src/quicktake/qtkn_platform.s
github.com
https://github.com/colinleroy/a2tools/blob/master/src/quicktake/qtk_bithuff.s
github.com