Count trailing zeros
The ctz instructions, short for count trailing zeros, are used to count the amount of zeros at the start of the numbers binary representation.
Try it
Syntax
;; load a number onto the stack
i32.const 8388608 ;; 00000000_10000000_00000000_00000000
;; count trailing zeros
i32.ctz
;; the top item on the stack will now be 23
| Instruction | Binary opcode |
|---|---|
i32.ctz |
0x68 |
i64.ctz |
0x7a |