Xilinx MicroBlaze Reference Manual page 224

clz Count Leading Zeros
rD, rA
clz
1 0 0 1 0 0
0
6
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.
MicroBlaze Processor Reference Guide
UG984 (v2018.2) June 21, 2018
Count leading zeros in rA
rD rA
11
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Chapter 5: MicroBlaze Instruction Set Architecture
0 0 0 0
0 0 0 0 1 1 1 0 0 0 0 0
16 21 31
225
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