Xilinx MicroBlaze Reference Manual page 228

Embedded development kit edk 14.7
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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.
228
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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)

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