Inc. Typewriter User Manual

MicroBlaze Processor Reference Guide www.xilinx.com 123
UG081 (v6.0) June 1, 2006 1-800-255-7778
Instructions
R
pcmpbf
Pattern Compare Byte Find
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
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