Zbb Extension

14 instructions and 0 pseudo-instructions in the Zbb extension.

• clz - Count leading zero bits
• clzw - Count leading zero bits in word
• cpop - Count set bits
• cpopw - Count set bits in word
• ctz - Count trailing zero bits
• ctzw - Count trailing zero bits in word
• 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