Sep 14, 2022, 19:50 by r...@remlab.net:
> From: Rémi Denis-Courmont <r...@remlab.net>
>
> This introduces compile-tim and run-time CPU detection on RISC-V. In
> practice, I doubt that FFmpeg will ever see a RISC-V CPU without the F
> extension, and if it does, it probably won't have run-time detection.
> So the flag is essentially always set.
>
> But as things stand, checkasm wants it that way, and we are nowhere
> near running short on CPU flag bits on that platform.
> ---
> libavutil/cpu.c | 4 ++++
> libavutil/cpu.h | 3 +++
> libavutil/cpu_internal.h | 1 +
> libavutil/riscv/Makefile | 1 +
> libavutil/riscv/cpu.c | 44 +++++++++++++++++++++++++++++++++++++++
> tests/checkasm/checkasm.c | 2 ++
> 6 files changed, 55 insertions(+)
> create mode 100644 libavutil/riscv/Makefile
> create mode 100644 libavutil/riscv/cpu.c
>
> diff --git a/libavutil/cpu.c b/libavutil/cpu.c
> index 0035e927a5..6e9b8c5f58 100644
> --- a/libavutil/cpu.c
> +++ b/libavutil/cpu.c
> @@ -62,6 +62,8 @@ static int get_cpu_flags(void)
> return ff_get_cpu_flags_arm();
> #elif ARCH_PPC
> return ff_get_cpu_flags_ppc();
> +#elif ARCH_RISCV
> + return ff_get_cpu_flags_riscv();
> #elif ARCH_X86
> return ff_get_cpu_flags_x86();
> #elif ARCH_LOONGARCH
> @@ -178,6 +180,8 @@ int av_parse_cpu_caps(unsigned *flags, const char *s)
> #elif ARCH_LOONGARCH
> { "lsx", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_LSX },
> .unit = "flags" },
> { "lasx", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_LASX },
> .unit = "flags" },
> +#elif ARCH_RISCV
> + { "float", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_F
> }, .unit = "flags" },
> #endif
> { NULL },
> };
> diff --git a/libavutil/cpu.h b/libavutil/cpu.h
> index 9711e574c5..71ae70bcbd 100644
> --- a/libavutil/cpu.h
> +++ b/libavutil/cpu.h
> @@ -78,6 +78,9 @@
> #define AV_CPU_FLAG_LSX (1 << 0)
> #define AV_CPU_FLAG_LASX (1 << 1)
>
> +// RISC-V Vector extension
> +#define AV_CPU_FLAG_F (1 << 0)
>
Can you prefix that with RV (FLAG_RVF) like the function?
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