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The Linux kernel configuration item CONFIG_RISCV_ISA_ZBB
:
( CONFIG_TOOLCHAIN_HAS_ZBB ) && ( CONFIG_RISCV_ALTERNATIVE )
Adds support to dynamically detect the presence of the ZBB extension (basic bit manipulation) and enable its usage.
The Zbb extension provides instructions to accelerate a number of bit-specific operations (count bit population, sign extending, bitrotation, etc).
If you don't know what to do here, say Y.
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