Verification should not succeed if the given string is too short to be a
real hash.

Fixes videolan/dav1d#361

Martin Storsjö authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

The arm32 version is less generic and has a bit more caveats, but still
belongs as a shared utility in a header.

Niklas Haas authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

The current playback loop triggers a repaint on any single event,
including spammy events such as SDL_MOUSEMOTION.

Fix this by only repainting on SDL_WINDOWEVENT_EXPOSED, which is defined
as the event sent when the window was damaged and needs to be repainted,
as well as on new frames.

Fixes videolan/dav1d#356

Niklas Haas authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

Upstream libplacebo added support for dav1d integration directly,
allowing us to vastly simplify all of this code. In order to take
advantage of new optimizations, I had to allow update_frame to unref the
Dav1dPicture. (This is fine, since double unref is a no-op)

In addition, some of the functions we use were deprecated in recent
libplacebo versions, so since we're taking a new dependency we might as
well fix the deprecation warnings.

Niklas Haas authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

These functions are not thread-safe on GL, because they are not called
from the thread holding the GL context. Work around this by simply
disabling it.

Not very optimal, but better than crashing.

Victorien Le Couviour--Tuffet authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

If the postfilter tasks allocation fails, a deadlock would occur.

Kyle Siefring authored 4 years ago and Martin Storsjö committed 4 years ago

- Reorder loads of filters to benifit in order cores.
- Use full 128-bit vectors to transpose 8x8 bytes. zip1 is called in the
   first stage which will hurt performance on some older big cores.
- Rework horz stage for 8 bit mode:
    * Use smull instead of mul
    * Replace existing narrow and long instructions
    * Replace mov after calling with right shift

Before:            Cortex A55    A53     A72     A73
warp_8x8_8bpc_neon:    1683.2  1860.6  1065.0  1102.6
warp_8x8t_8bpc_neon:   1673.2  1846.4  1057.0  1098.4
warp_8x8_16bpc_neon:   1870.7  2031.7  1147.3  1220.7
warp_8x8t_16bpc_neon:  1848.0  2006.2  1121.6  1188.0
After:
warp_8x8_8bpc_neon:    1267.2  1446.2   807.0   871.5
warp_8x8t_8bpc_neon:   1245.4  1422.0   810.2   868.4
warp_8x8_16bpc_neon:   1769.8  1929.3  1132.0  1238.2
warp_8x8t_16bpc_neon:  1747.3  1904.1  1101.5  1207.9

Cortex-A55
Before:
warp_8x8_8bpc_neon:   1683.2
warp_8x8t_8bpc_neon:  1673.2
warp_8x8_16bpc_neon:  1870.7
warp_8x8t_16bpc_neon: 1848.0
After:
warp_8x8_8bpc_neon:   1267.2
warp_8x8t_8bpc_neon:  1245.4
warp_8x8_16bpc_neon:  1769.8
warp_8x8t_16bpc_neon: 1747.3

Kyle Siefring authored 4 years ago and Martin Storsjö committed 4 years ago

Avoid moving between 8 and 16-bit vectors where possible.

Kyle Siefring authored 4 years ago and Martin Storsjö committed 4 years ago

Use mla (8-bit -> 8-bit) instead of smlal (8-bit -> 16-bit).

Before:                 Cortex A53     A72     A73
cdef_filter_4x4_8bpc_neon:   389.7   264.0   261.7
cdef_filter_4x8_8bpc_neon:   687.2   476.2   465.5
cdef_filter_8x8_8bpc_neon:  1152.9   752.1   789.5
After:
cdef_filter_4x4_8bpc_neon:   385.2   263.4   259.2
cdef_filter_4x8_8bpc_neon:   677.5   473.8   459.8
cdef_filter_8x8_8bpc_neon:  1134.4   744.6   774.6

Anton Mitrofanov authored 4 years ago and James Almer committed 4 years ago

Signed-off-by: James Almer <jamrial@gmail.com>

Matthias Dressel authored 4 years ago and Ronald S. Bultje committed 4 years ago

Should make the code more readable.

Matthias Dressel authored 4 years ago and Ronald S. Bultje committed 4 years ago

Replace checks for INTER or SWITCH frames with a simple macro for
increased readability and maintainability.

Only doing this for 8bpc; for higher bitdepths, adding the input
coefficients can overflow a signed 16 bit element.

Before:               Cortex A53       A72       A73
wiener_7tap_8bpc_neon:  142985.0   94400.8   89959.3

After:
wiener_7tap_8bpc_neon:  136614.4   88828.3   86997.0

This gives a minor speedup on 8 bpc and a bit bigger speedup on 16
bpc. Sample speedups from arm64:

Before:                Cortex A53       A72       A73
wiener_7tap_8bpc_neon:   143885.7  101571.5   96187.2
wiener_7tap_10bpc_neon:  171210.8  119410.4  122447.8

After:
wiener_7tap_8bpc_neon:   142985.0   94400.8   89959.3
wiener_7tap_10bpc_neon:  168818.4  113980.2  116662.0

Use a variable mask for inserting padding, instead of fixed code paths
for different padding widths.

This allows simplifying the filtering logic to simply always process
8 pixels at a time.

Also improve scheduling of the loop subtract instruction in all these
cases.

Calling dav1d_close already takes care of flushing the internal state.
Calling it just before is superfluous.

Remains from code restructuring in 89ea92ba

Henrik Gramner authored 4 years ago and Henrik Gramner committed 4 years ago

SGR uses edge detection to decide which pixels to modify, but if the
input is pure random noise there isn't going to be many (if any) edges.
As a result the entire function call often ends up doing nothing,
which isn't ideal when we want test code for correctness.

Change the input randomization algorithm to generate a checkerboard
pattern with limited noise applied to the flat areas.

Kyle Siefring authored 4 years ago and Henrik Gramner committed 4 years ago

On zen 2 and 3, vpermq is slower than vperm2i128. In some assembly, we
use the former to swap lanes of a vector when we could be using the
latter.

On zen 1, the most expensive instruction is swapped, so this patch will
be slower on them.

On current intel cpus, these instructions are equally expensive, so
there should be no impact there.

oss-fuzz uses '-Denable_tools=false'.

Kyle Siefring authored 4 years ago and Martin Storsjö committed 4 years ago

Before:            Cortex A53     A55     A72     A73
cdef_dir_8bpc_neon:     400.0   391.2   269.7   282.9
cdef_dir_16bpc_neon:    417.7   413.0   303.8   313.6

After: Cortex A55
cdef_dir_8bpc_neon:     369.0   360.2   248.4   273.4
cdef_dir_16bpc_neon:    388.7   384.0   272.2   290.7

Closes #203.

Nathan E. Egge authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

Relative speed-ups compared with gcc-9.2.0:

                                  Before     After
mc_8tap_regular_w2_h_16bpc_c:      276.6     219.9
mc_8tap_regular_w4_h_16bpc_c:      489.5     374.5
mc_8tap_regular_w8_h_16bpc_c:      897.7     686.8
mc_8tap_regular_w16_h_16bpc_c:    2573.7    2314.2
mc_8tap_regular_w32_h_16bpc_c:    7647.3    7012.4
mc_8tap_regular_w64_h_16bpc_c:   28163.8   25057.4
mc_8tap_regular_w128_h_16bpc_c:  77678.4   73570.0

Kyle Siefring authored 4 years ago and Jean-Baptiste Kempf committed 4 years ago

Remove half of the masks since they are only used for cdef on a 8x8
level of granularity.

Load the mask and combine the 16-bit sections into the 32-bit sections
outside of the inner cdef loop. This should save some registers.

Results in mild performance improvements.