On AArch64, the performance counter registers usually are
restricted and not accessible from user space.

On macOS, we currently use mach_absolute_time() as timer on
aarch64. This measures wallclock time but with a very coarse
resolution.

There is a private API, kperf, that one can use for getting
high precision timers though. Unfortunately, it requires running
the checkasm binary as root (e.g. with sudo).

Also, as it is a private, undocumented API, it can potentially
change at any time.

This is handled by adding a new meson build option, for switching
to this timer. If the timer source in checkasm could be changed
at runtime with an option, this wouldn't need to be a build time
option.

This allows getting benchmarks like this:

mc_8tap_regular_w16_hv_8bpc_c:              1522.1 ( 1.00x)
mc_8tap_regular_w16_hv_8bpc_neon:            331.8 ( 4.59x)

Instead of this:

mc_8tap_regular_w16_hv_8bpc_c:                 9.0 ( 1.00x)
mc_8tap_regular_w16_hv_8bpc_neon:              1.9 ( 4.76x)

Co-authored-by: J. Dekker <jdek@itanimul.li>

Matthias Dressel authored 1 year ago and Ronald S. Bultje committed 1 year ago

Allows to explicitly enable/disable seek-stress tests.

Henrik Gramner authored 2 years ago and Henrik Gramner committed 2 years ago

When compiling with asm enabled there's no point in compiling
C versions of DSP functions that have asm implementations using
instruction sets that the compiler can unconditionally use.

E.g. when compiling with -mssse3 we can remove the C version
of all functions with SSSE3 implementations.

This is accomplished using the compiler's dead code elimination
functionality.

Can be configured using the new 'trim_dsp' meson option, which
by default is enabled when compiling in release mode.

Co-authored-by: Rudi Heitbaum <rudi@heitbaum.com>

Janne Grunau authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

The required 'xxhash.h' header can either be in system include directory
or can be copied to 'tools/output'.

The xxh3_128bits based muxer shows no significant slowdown compared to
the null muxer. Decoding times Chimera-AV1-8bit-1920x1080-6736kbps.ivf
with 4 frame and 4 tile threads on a core i7-8550U (disabled turbo boost):

null:  72.5 s
md5:   99.8 s
xxh3:  73.8 s

Decoding Chimera-AV1-10bit-1920x1080-6191kbps.ivf with 6 frame and 4 tile
threads on a m1 mc mini:

null:  27.8 s
md5:  105.9 s
xxh3:  28.3 s

Allows building with nasm < 2.14.

dav1dplay shouldn't be built by default. And it's an example more than a tool.

'build_' prefix is reserved by meson, this will become an error in the
future, as indicated by a warning when configuring the build dir.

Closes #285.

Needed for oss-fuzz after switching to '-fsanitize=fuzzer' for the
libfuzzer based build. Adding '-fsanitize=fuzzer' for all oss-fuzz based
build breaks afl.

Martin Storsjö authored 6 years ago and Henrik Gramner committed 6 years ago

This is intended only for use in CI testing.

Janne Grunau authored 6 years ago and Ronald S. Bultje committed 6 years ago

Replaces the boolean 'build_libfuzzer' meson option with 'fuzzing_engine'.
This allows reproducing fuzzing test cases on systems without libfuzzer.
Also prevents regressions in the fuzzing test target since it will be
build by default.

Disabled by default, enabble with `meson -Dbuild_libfuzzer=true -Db_lundef=false ...`.
Fuzz target improved by the paralell work by Thierry Foucu in !138.

With minor contributions from:
 - Jean-Baptiste Kempf <jb@videolan.org>
 - Marvin Scholz <epirat07@gmail.com>
 - Hugo Beauzée-Luyssen <hugo@videolan.org>