MicroBlaze Processor Reference Guide 225
UG984 (v2018.2) June 21, 2018 www.xilinx.com
Chapter 5: MicroBlaze Instruction Set Architecture
clz
Count Leading Zeros
clz
rD, rA
Count leading zeros in rA
1 0 0 1 0 0 rD rA 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0
0 6 11 16 21
31
Description
This instruction counts the number of leading zeros in register rA starting from the most significant
bit. The result is a number between 0 and 32, stored in register rD.
The result in rD is 32 when rA is 0, and it is 0 if rA is 0xFFFFFFFF.
Pseudocode
n ← 0
while (rA)[n] = 0
n ← n + 1
(rD)
← n
Registers Altered
•rD
Latency
• 1 cycle
Note
This instruction is only available when the parameter C_USE_PCMP_INSTR is set to 1.
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