Julian Zhu 4c966c0780 RISC-V: Use builtin for ffs and ffsll while supported extension available ...

Hardware ctz instructions are available in the RISC-V Zbb and XTheadBb extension. With special `-march` flags defined, we can generate more simplified code compared to the generic implementation of `ffs`/`ffsll`.

Signed-off-by: Julian Zhu <julian.oerv@isrc.iscas.ac.cn>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

2025-04-28 09:51:59 -03:00

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