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| author | Rémi Denis-Courmont <remi@remlab.net> | 2022-09-12 18:53:17 +0300 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2022-09-13 16:50:43 -0300 |
| commit | d808070547a867a8f3f7b97fdff3574576213c07 (patch) | |
| tree | 08a834e08e42ee621c01a7bddae60cc20cef3628 /libavformat/img2.c | |
| parent | 092ce9712f63fc2641ec831d09c8ca0731083ae4 (diff) | |
| download | ffmpeg-d808070547a867a8f3f7b97fdff3574576213c07.tar.gz | |
lavu/riscv: AV_READ_TIME cycle counter
This uses the architected RISC-V 64-bit cycle counter from the
RISC-V unprivileged instruction set.
In 64-bit and 128-bit, this is a straightforward CSR read.
In 32-bit mode, the 64-bit value is exposed as two CSRs, which
cannot be read atomically, so a loop is necessary to detect and fix up
the race condition where the bottom half wraps exactly between the two
reads.
Diffstat (limited to 'libavformat/img2.c')
0 files changed, 0 insertions, 0 deletions