ffmpeg | branch: master | Rémi Denis-Courmont <r...@remlab.net> | Mon Sep 12 18:53:18 2022 +0300| [ff14e3739393147b4596245ea511ec43a4ce6448] | committer: James Almer
configure/riscv: detect fast CLZ RISC-V defines the CLZ instruction as part of the ratified Zbb subset of the (not yet ratified) bit mapulation extension (B). We can detect it from the __riscv_zbb predefined constant. At least GCC 12 already supports this correctly. Note that the macro will be non-zero if supported, zero if enabled in the compiler flags (e.g. -march=rv64gzbb) but not known to the compiler, and undefined otherwise. > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ff14e3739393147b4596245ea511ec43a4ce6448 --- configure | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/configure b/configure index 9e51abd0d3..b7dc1d8656 100755 --- a/configure +++ b/configure @@ -5334,6 +5334,12 @@ elif enabled ppc; then ;; esac +elif enabled riscv; then + + if test_cpp_condition stddef.h "__riscv_zbb"; then + enable fast_clz + fi + elif enabled sparc; then case $cpu in _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
