The RISC-V B bit manipulation extension was ratified only two months ago.
But it is strictly equivalent to the union of the zba, zbb and zbs
extensions which were defined almost 3 years earlier. Rather than require
new assembler, we can just match the extension name manually and translate
it into its constituent parts.
---
libavutil/riscv/asm.S | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavutil/riscv/asm.S b/libavutil/riscv/asm.S
index 78e9defbd4..0c29680d84 100644
--- a/libavutil/riscv/asm.S
+++ b/libavutil/riscv/asm.S
@@ -38,7 +38,12 @@
.macro archadd ext=, more:vararg
.ifnb \ext
- .option arch, +\ext
+ .ifc \ext, b
+ # B was defined later, is known to fewer assemblers.
+ archadd zba, zbb, zbs
+ .else
+ .option arch, +\ext
+ .endif
archadd \more
.endif
.endm
--
2.45.2
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