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[FFmpeg-devel] lavu/riscv: remove bogus B extension

Message ID 20240511160731.60715-1-remi@remlab.net
State Accepted
Commit 20fbc07af1ebd5a68b8fd1203ceb4cab60bd7328
Headers show
Series [FFmpeg-devel] lavu/riscv: remove bogus B extension | expand

Commit Message

Rémi Denis-Courmont May 11, 2024, 4:07 p.m. UTC 
The B Bit manipulation extension was not defined to this day, and
probably never will. Instead it was broken down into Zba, Zbb, Zbc and
Zbs with no particular blessed set to make up B.

This removes the bogus field test. Linux never set this bit, nor
(AFAICT) did FreeBSD or any other OS. We can always add it back in the
unlikely event that it gets taken into use.
---
 libavutil/riscv/cpu.c | 2 --
 1 file changed, 2 deletions(-)
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Patch

diff --git a/libavutil/riscv/cpu.c b/libavutil/riscv/cpu.c
index eba7d3acfc..7b8aa7ac21 100644
--- a/libavutil/riscv/cpu.c
+++ b/libavutil/riscv/cpu.c
@@ -90,8 +90,6 @@  int ff_get_cpu_flags_riscv(void)
             ret |= AV_CPU_FLAG_RVF;
         if (hwcap & HWCAP_RV('D'))
             ret |= AV_CPU_FLAG_RVD;
-        if (hwcap & HWCAP_RV('B'))
-            ret |= AV_CPU_FLAG_RVB_ADDR | AV_CPU_FLAG_RVB_BASIC;
 
         /* The V extension implies all Zve* functional subsets */
         if (hwcap & HWCAP_RV('V'))