gsm-codec-lib: libgsmefr/tls_flags.c annotate

annotate libgsmefr/tls_flags.c @ 107:41f1ae68d253

amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling

author	Mychaela Falconia <falcon@freecalypso.org>
date	Sun, 27 Nov 2022 21:02:07 +0000
parents	38326102fc43
children

rev	line source
38 38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	1 /*
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	2 * Unfortunately the code we got from ETSI makes heavy use of two global
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	3 * Boolean flags named Carry and Overflow that function like equally named
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	4 * processor state flags on many CPU architectures. They are not part
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	5 * of persistent codec session state for either the encoder or the decoder,
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	6 * instead they are "short-term" globals much like UNIX errno.
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	7 *
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	8 * Given this unfortunate reality plus the natural desire to make our
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	9 * EFR library thread-safe (a transcoding MGW handling a large volume of
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	10 * simultaneous calls is exactly the kind of application that would benefit
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	11 * from utilitizing all CPU cores), our current workaround is to use
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 * thread-local storage.
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 */
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 #include <stdint.h>
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16 #include "typedef.h"
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17
38326102fc43 libgsmefr: beginning to integrate code from ETSI Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 __thread Flag EFR__Carry, EFR__Overflow;