Zbb Extension

14 instructions in the Zbb extension.

• clz — Count leading zero bits
• clzw — Count leading zero bits in word 64
• cpop — Count set bits
• cpopw — Count set bits in word 64
• ctz — Count trailing zero bits
• ctzw — Count trailing zero bits in word 64
• max — Maximum
• maxu — Unsigned maximum
• min — Minimum
• minu — Unsigned minimum
• orc.b — Bitware OR-combine, byte granule
• sext.b — Sign-extend byte
• sext.h — Sign-extend halfword
• zext.h — Zero-extend halfword