After checking if -ldl exists, use it for checking for the dlsym
function.

This fixes building in environments where the dlsym function is
unavailable. (My testcase is NDK builds with -static, where dlsym
isn't available for static linking, only if linking dynamically.)

Henrik Gramner authored 5 years ago and Henrik Gramner committed 5 years ago

Also make the cpuid code a bit more explicit.

The end index given for the top/right edge pixels
was incorrect.

Henrik Gramner authored 5 years ago and Henrik Gramner committed 5 years ago

Doing so is technically undefined behavior even though the pointers
are never dereferenced.

Henrik Gramner authored 5 years ago and Henrik Gramner committed 5 years ago

Memory addresses with certain power-of-two offsets will map to the
same set of cache lines. Using such offsets as strides will cause
excessive cache evictions resulting in more cache misses.

Avoid this by adding a small padding when the stride is a multiple
of 1024 (somewhat arbitrarily chosen as the specific number depends
on the hardware implementation) when allocating picture buffers.

Janne Grunau authored 5 years ago and Henrik Gramner committed 5 years ago

Also prefer clock_gettime over mach_absolute_time on darwin.
clock_gettime is only available in darwin 10.12 and later.

Hopefully fixes #283.

Henrik Gramner authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

Only a number that changes on every run is required.

Jan Beich authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

tests/checkasm/checkasm.c:55:5: warning: implicit declaration of function 'gettimeofday' is invalid in C99 [-Wimplicit-function-declaration]
    gettimeofday(&tv, NULL);
    ^

Luc Trudeau authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

Applying non-zero offset to a NULL pointer is undefined behavior

Konstantin Pavlov authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

This enables releasing stable versions on the snap store.

Henrik Gramner authored 5 years ago and Henrik Gramner committed 5 years ago

The latter is marked as obsolete by POSIX.

This fixes these warnings with MSVC:
warning C4267: '+=': conversion from 'size_t' to 'int', possible loss of data

Prevents the following compiler warning:

../src/decode.c:1979:32: warning: implicit conversion loses integer precision: 'const ptrdiff_t' (aka 'const long') to 'int' [-Wshorten-64-to-32]
            const int stride = f->cur.stride[!!p];
                      ~~~~~~   ^~~~~~~~~~~~~~~~~~
1 warning generated.

Should fix failures of 'section5' sample on 32-bit systems.

This allows auto-detection between section5 and annexb files, which
share the same extension.

Fixes #304.

Fixes #309.

Luc Trudeau authored 5 years ago and Jean-Baptiste Kempf committed 5 years ago

Enforces software engineering best practices

B Krishnan Iyer authored 5 years ago and Martin Storsjö committed 5 years ago

		                                A73			A53

                                		Earlier	Now		Earlier	Now

intra_pred_dc_top_w64_8bpc_neon:		344.4	344.6		253.4	252.3

This was requested in the review of the arm32 version of the same.

This removes one redundant instruction for loop filters smaller
than 16.

This doesn't change performance measurably, but eases potential
future maintainance of the code.

The code is a fairly exact 1:1 port of the ARM64 code, but operating
on 8 pixels at a time, instead of 16.

Relative speedup over C code according to checkasm:
                       Cortex A7     A8     A9    A53    A72    A73
lpf_h_sb_uv_w4_8bpc_neon:   1.36   1.40   1.25   1.71   1.55   1.59
lpf_h_sb_uv_w6_8bpc_neon:   2.18   2.11   1.74   2.65   2.32   2.34
lpf_h_sb_y_w4_8bpc_neon:    1.48   1.43   1.20   1.91   1.49   1.64
lpf_h_sb_y_w8_8bpc_neon:    2.34   2.05   1.78   2.84   2.35   2.69
lpf_h_sb_y_w16_8bpc_neon:   2.13   1.83   1.63   2.51   2.10   2.35
lpf_v_sb_uv_w4_8bpc_neon:   1.69   1.66   1.60   2.16   2.24   2.24
lpf_v_sb_uv_w6_8bpc_neon:   2.68   2.43   2.22   3.53   3.44   3.35
lpf_v_sb_y_w4_8bpc_neon:    1.74   1.74   1.43   2.34   2.14   2.18
lpf_v_sb_y_w8_8bpc_neon:    2.92   2.47   2.19   3.55   3.22   3.54
lpf_v_sb_y_w16_8bpc_neon:   2.62   2.19   1.98   3.25   2.80   3.10

Comparison to the original ARM64 assembly:
ARM64:                        A53     A72     A73
lpf_h_sb_uv_w4_8bpc_neon:   702.5   518.2   529.1
lpf_h_sb_uv_w6_8bpc_neon:  1007.3   672.6   736.6
lpf_h_sb_y_w4_8bpc_neon:   1652.8  1261.2  1276.5
lpf_h_sb_y_w8_8bpc_neon:   2144.7  1559.8  1638.7
lpf_h_sb_y_w16_8bpc_neon:  2318.3  1757.2  1792.8
lpf_v_sb_uv_w4_8bpc_neon:   447.1   302.0   292.4
lpf_v_sb_uv_w6_8bpc_neon:   600.0   397.7   406.9
lpf_v_sb_y_w4_8bpc_neon:   1212.6   840.1   818.4
lpf_v_sb_y_w8_8bpc_neon:   1623.3  1167.4  1156.7
lpf_v_sb_y_w16_8bpc_neon:  1694.9  1237.9  1182.3
ARM32:
lpf_h_sb_uv_w4_8bpc_neon:   821.2   501.1   500.8
lpf_h_sb_uv_w6_8bpc_neon:  1232.0   715.7   746.6
lpf_h_sb_y_w4_8bpc_neon:   2208.1  1373.2  1414.7
lpf_h_sb_y_w8_8bpc_neon:   3138.3  1843.1  1915.2
lpf_h_sb_y_w16_8bpc_neon:  3293.1  1842.5  1975.9
lpf_v_sb_uv_w4_8bpc_neon:   619.9   326.7   324.9
lpf_v_sb_uv_w6_8bpc_neon:   855.9   446.7   468.2
lpf_v_sb_y_w4_8bpc_neon:   1737.6   935.5  1007.0
lpf_v_sb_y_w8_8bpc_neon:   2346.7  1232.8  1298.3
lpf_v_sb_y_w16_8bpc_neon:  2353.4  1283.4  1379.9