Gr/Br Moves; Move To Br Whether Hint Completer - Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 3 REV 2.3 Manual

4.3.4.2 Break (I-Unit)
40
I19
Instruction
i
break.i
4.3.4.3 Integer Speculation Check (I-Unit)
40
I20
Instruction
chk.s.i
4.3.5

GR/BR Moves

The GR/BR move instructions are encoded in major opcode 0. See
Instructions" on page 3:318
instruction uses a 2-bit "whether" prediction hint field in bits 21:20 (wh) as shown in
Table 4-27.
Table 4-27.
Bits 21:20
The mov to BR instruction also uses a 1-bit opcode extension field (x) in bit 22 to
distinguish the return form from the normal form, and a 1-bit hint extension in bit 23
(ih) (see
4.3.5.1 Move to BR
40
I21
Instruction
mov.mwh.ih
mov.ret.mwh.ih
3:320
37 36 35 33 32
0 i x x
3 6
4 1 3 6
Operands
imm
21
37 36 35 33 32
0 s x
3
4 1 3
Operands
r , target
2 25
for a summary of the opcode extensions. The mov to BR

Move to BR Whether Hint Completer

wh
mwh
0 .sptk
1 none
2 .dptk
3
Table 4-56 on page 3:354).
37 36 35 33 32
0 x timm
3
4 1 3 9
Operands
b = r , tag
1 2 13
27 26 25
imm
1 20
Opcode
0
20 19
imm r
13c 2
13 7
Opcode
0
24 23 22 21 20 19
ih x wh r
9c 2
1 1 2 7
Opcode
x
x
3
0
0 7
1
6 5
20a
Extension
x x
3 6
0 00
13 12 6 5
imm
7a
7
Extension
x
3
1
"Miscellaneous I-Unit
13 12 9 8 6 5
b
1
4 3
Extension
ih wh
See Table 4-56 See Table 4-27
on page 3:354 on page 3:320
Volume 3: Instruction Formats
0
qp
6
0
qp
6
0
qp
6