Xilinx MicroBlaze Reference Manual page 266

pcmpbf Pattern Compare Byte Find
rD, rA, rB
pcmpbf
1 0 0 0 0 0
0
6
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)
else
if rB[24:31] = rA[24:31] then
←
(rD)
else
←
(rD)
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
bytewise comparison returning position of first match
rD rA
11
3
4
0
www.xilinx.com
Chapter 5: MicroBlaze Instruction Set Architecture
rB 1 0 0 0 0 0 0 0 0 0 0
16 21 31
267
Send Feedback