Xilinx MicroBlaze Reference Manual page 228

Chapter 5: MicroBlaze Instruction Set Architecture
pcmpbf
Pattern Compare Byte Find
pcmpbf
1 0 0 0 0 0
0 6
Description
The contents of register rA is bytewise compared with the contents in register rB.
•
•
Pseudocode
Registers Altered
•
Latency
•
Note
This instruction is only available when the parameter C_USE_PCMP_INSTR is set to 1.
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rD, rA, rB
rD rA
1
1
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
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
rD
1 cycle
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bytewise comparison returning position of first
match
rB 1 0 0 0 0 0 0 0 0 0 0
1 2
6 1
MicroBlaze Processor Reference Guide
3
1
UG081 (v14.7)