Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1207

Table 4-15.
Opcode
Bits
40:37
8
3:308
Multimedia ALU Size 4 4-bit+2-bit Opcode Extensions
x z z x
2a a b 4
Bits Bit Bit Bits
35:34 36 33 32:29
0
1
2
3
4
5
6
7
1 1 0
8
9 pcmp4.eq
A
B
C
D
E
F
Bits 28:27
0 1
padd4 A9
psub4 A9
A9 pcmp4.gt A9
x
2b
2
Volume 3: Instruction Formats
3