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ffmpeg/libavutil/riscv
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Nathan E. Egge 8280ec7a32 lavu/riscv: Revert d808070, removing AV_READ_TIME 
The implementation of ff_read_time() for RISC-V uses rdtime which has
 precision on existing hardware too low (!) for benchmarking purposes.
Deleting this implementation falls back on clock_gettime() which was
 added as the default ff_read_time() implementation in 33e4cc9.
Below are metrics gathered on SpacemiT K1, before and after this commit:

Before:

$ tests/checkasm/checkasm --bench
benchmarking with native FFmpeg timers
nop: 0.0
checkasm: using random seed 3473665261
checkasm: bench runs 1024 (1 << 10)
RVI:
 - pixblockdsp.get_pixels                [OK]
 - vc1dsp.mspel_pixels                   [OK]
RVF:
 - audiodsp.audiodsp                     [OK]
checkasm: all 4 tests passed
audiodsp.vector_clipf_c: 1388.7
audiodsp.vector_clipf_rvf: 261.5
get_pixels_c: 2.0
get_pixels_rvi: 1.5
vc1dsp.put_vc1_mspel_pixels_tab[0][0]_c: 8.0
vc1dsp.put_vc1_mspel_pixels_tab[0][0]_rvi: 1.0
vc1dsp.put_vc1_mspel_pixels_tab[1][0]_c: 2.0
vc1dsp.put_vc1_mspel_pixels_tab[1][0]_rvi: 0.5

After:

$ tests/checkasm/checkasm --bench
benchmarking with native FFmpeg timers
nop: 56.4
checkasm: using random seed 1021411603
checkasm: bench runs 1024 (1 << 10)
RVI:
 - pixblockdsp.get_pixels                [OK]
 - vc1dsp.mspel_pixels                   [OK]
RVF:
 - audiodsp.audiodsp                     [OK]
checkasm: all 4 tests passed
audiodsp.vector_clipf_c: 23236.4
audiodsp.vector_clipf_rvf: 11038.4
get_pixels_c: 79.6
get_pixels_rvi: 48.4
vc1dsp.put_vc1_mspel_pixels_tab[0][0]_c: 329.6
vc1dsp.put_vc1_mspel_pixels_tab[0][0]_rvi: 38.1
vc1dsp.put_vc1_mspel_pixels_tab[1][0]_c: 89.9
vc1dsp.put_vc1_mspel_pixels_tab[1][0]_rvi: 17.1

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
 		2024-07-31 17:48:50 +03:00
..
Makefile riscv: probe for Zbb extension at load time 2024-06-11 20:12:37 +03:00
asm.S lavu/riscv: assembly for zicfilp LPAD 2024-07-25 23:10:14 +03:00
bswap.h lavu/riscv: use Zbb REV8 at run-time 2024-06-11 20:12:37 +03:00
bswap_rvb.S lavu/riscv: count bytes rather than words for bswap32 2024-07-30 18:41:51 +03:00
cpu.c lavu/riscv: add CPU flag for B bit manipulations 2024-07-25 23:09:58 +03:00
cpu.h avutil/riscv/cpu: fix __riscv_v_min_vlen typo 2024-06-26 12:50:02 +02:00
cpu_common.c riscv: probe for Zbb extension at load time 2024-06-11 20:12:37 +03:00
fixed_dsp_init.c
…
fixed_dsp_rvv.S lavu/riscv: add forward-edge CFI landing pads 2024-07-25 23:10:14 +03:00
float_dsp_init.c lavu/float_dsp: R-V V scalarproduct_double 2024-05-31 22:22:43 +03:00
float_dsp_rvv.S lavu/riscv: add forward-edge CFI landing pads 2024-07-25 23:10:14 +03:00
intmath.h lavu/riscv: implement floating point clips 2024-07-28 21:24:58 +03:00
lls_init.c lavu/lls: R-V V update_lls 2024-06-01 18:05:58 +03:00
lls_rvv.S lavu/riscv: add forward-edge CFI landing pads 2024-07-25 23:10:14 +03:00