PR #24231 opened by CheryDan URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24231 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24231.patch
# Require 128-bit VLEN for `RISCV_HWPROBE_IMA_V` Add the existing `VLEN >= 128` check to the `RISCV_HWPROBE_IMA_V` detection path, keeping it consistent with the Zve-based path. This prevents RVV CPU flags from being enabled on systems with a smaller VLEN. >From ad45932f5b6a0b556163b6c3887a4b04fc7ed453 Mon Sep 17 00:00:00 2001 From: daichengrong <[email protected]> Date: Fri, 21 Aug 2026 17:55:19 +0800 Subject: [PATCH] riscv: cpu: Check VLEN for RISCV_HWPROBE_IMA_V Require ff_get_rv_vlenb() >= 16 when detecting the V extension through RISCV_HWPROBE_IMA_V, matching the existing Zve detection path. This keeps the minimum 128-bit VLEN requirement consistent across both hwprobe paths. Signed-off-by: daichengrong <[email protected]> --- libavutil/riscv/cpu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavutil/riscv/cpu.c b/libavutil/riscv/cpu.c index 481d63a39f..b1a2fc9c02 100644 --- a/libavutil/riscv/cpu.c +++ b/libavutil/riscv/cpu.c @@ -63,7 +63,8 @@ int ff_get_cpu_flags_riscv(void) if (pairs[0].value & RISCV_HWPROBE_BASE_BEHAVIOR_IMA) ret |= AV_CPU_FLAG_RVI; #ifdef RISCV_HWPROBE_IMA_V - if (pairs[1].value & RISCV_HWPROBE_IMA_V) + if ((pairs[1].value & RISCV_HWPROBE_IMA_V) && + ff_get_rv_vlenb() >= 16) ret |= AV_CPU_FLAG_RVV_I32 | AV_CPU_FLAG_RVV_I64 | AV_CPU_FLAG_RVV_F32 | AV_CPU_FLAG_RVV_F64; #ifdef RISCV_HWPROBE_EXT_ZVE32X -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
