MicroBlaze Processor Reference Guide 267
UG984 (v2018.2) June 21, 2018 www.xilinx.com
Chapter 5: MicroBlaze Instruction Set Architecture
pcmpbf
Pattern Compare Byte Find
pcmpbf
rD, rA, rB
bytewise comparison returning position of first match
1 0 0 0 0 0 rD rA rB 1 0 0 0 0 0 0 0 0 0 0
0 6 11 16 21
31
Description
The contents of register rA is bytewise compared with the contents in register rB.
• rD is loaded with the position of the first matching byte pair, starting with MSB as
position 1, and comparing until LSB as position 4
• If none of the byte pairs match, rD is set to 0
Pseudocode
if rB[0:7] = rA[0:7] then
(rD) ← 1
else
if rB[8:15] = rA[8:15] then
(rD)
← 2
else
if rB[16:23] = rA[16:23] then
(rD)
← 3
else
if rB[24:31] = rA[24:31] then
(rD)
← 4
else
(rD)
← 0
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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