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rockbox/lib/rbcodec/codecs
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Michael Giacomelli 374f7c0334 flac: ARM assembly for the 64-bit LPC filter 
Replaces flac_lpc_32_c, the wide predictor path every 24-bit stream
takes, and 16-bit streams encoded at high coefficient precision. The
coefficients are invariant for the whole call, but the C loop reloaded
all of them for every output sample and spilled its loop bound to the
stack on top of that. Orders 1-8 now keep every coefficient in a
register; orders 10 and 12, which is what -8 emits, get their own
unrolled loops instead of the generic chunked one. An ARMv5E kernel
using the packed 16-bit multiplies is included behind
FLAC_LPC32_NARROW_ASM, off by default: it needs bps <= 16, and only
about half the subframes of such a stream can use it.

Measured with test_codec on 24-bit/96kHz streams. At predictor order 12:
36.24 MHz on e200 (ARMv4) against 62.29 MHz before. The same file
improves from 37.65 MHz to 27.3 MHz on Clip+ (ARMv5).

Bit-exact against flac -d over four complete streams on both targets,
with and without the assembly, and the kernels are checked against an
int64_t reference across every order 1-32, qlevel 0-15 and coefficient
precision 1-15.

The rarely-executed orders stay in DRAM: the codec's IRAM window on
PP502x is nearly full and demoting them measured no cost, leaving 96
bytes free. FLAC_LPC32_NO_IRAM demotes the whole filter.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Change-Id: Icd8bd298973b9f5c26c103af8adf47b03489d69f
2026-10-05 12:19:09 -04:00
..
cRSID Revert "[BugFix] Enums are only 2 bytes on some Devices" 2024-11-24 11:38:16 -05:00
demac libdemac: reciprocal table for the pivot division on ARMv5+ 2026-10-05 10:19:38 -04:00
lib chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
liba52 chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libalac chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libasap chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libasf chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libatrac chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libayumi chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libcook chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libfaad chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libffmpegFLAC flac: ARM assembly for the 64-bit LPC filter 2026-10-05 12:19:09 -04:00
libgme chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libm4a libm4a: handle sparse chunk maps and video-first MP4 2026-09-07 09:17:27 -04:00
libmad chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libmusepack chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libopus opus: filter the PLC excitation in place 2026-09-30 11:25:30 -04:00
libpcm chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
librm Add "rbfs" prefix to native filesystem functions 2026-09-17 16:22:31 -04:00
libspc chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libspeex libspeex: Silence a spurious warning under Clang 2026-07-15 16:22:18 -04:00
libtremor chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libtta chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libwavpack chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libwma chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libwmapro chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
libwmavoice chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
a52.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
a52_rm.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
aac.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
aac_bsf.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
adx.c fix warnings on some systems / format specifier mismatch 2024-12-07 11:07:44 -05:00
aiff.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
aiff_enc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
alac.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
ape.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
asap.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
atrac3_oma.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
atrac3_rm.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
au.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
ay.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
codec_crt0.c 3ds: Port refactor. 2026-09-01 08:39:07 -04:00
codecs.h chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
codecs.make codecs: link libarm_support for its division routines 2026-10-05 07:46:37 -04:00
cook.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
flac.c flac: cope with frames larger than one buffer request 2026-10-03 18:17:56 -04:00
gbs.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
hes.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
kss.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
mod.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
mp3_enc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
mpa.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
mpc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
nsf.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
opus.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
raac.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
sgc.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
shorten.c codecs: Fix elapsed time calculation for large files 2018-10-29 19:50:34 +01:00
sid.c SID: Don't uselessly upconvert from 16bpp mono to 28bpp stereo 2025-09-02 20:19:22 -04:00
smaf.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
SOURCES warble: fix build on targets with HAVE_RECORDING 2026-08-25 08:01:09 -04:00
spc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
speex.c build: Silence a pile of set-but-not-used warnings in codecs 2026-05-17 16:39:06 -04:00
tta.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
vgm.c Remove explicit 'enum codec_command_action' in codec API 2017-12-07 14:41:59 -05:00
vorbis.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
vox.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
vtx.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wav.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wav64.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wav_enc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wavpack.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wavpack_enc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wma.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wmapro.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
wmavoice.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00