Parallel Compare Examples; Pcmp Relations - Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 3 REV 2.3 Manual

pcmp
pcmp — Parallel Compare
( ) pcmp1.
Format: qp
( ) pcmp2.
qp
( ) pcmp4.
qp
The two source operands are compared for one of the two relations shown in
Description:
Table 2-45. If the comparison condition is true for corresponding data elements of GR
and GR , then the corresponding data element in GR
r
3
comparison condition is false, then the corresponding data element in GR
zeros. For the '>' relation, both operands are interpreted as signed.
Table 2-45.
prel
eq
gt
Figure 2-33.
GR r :
3
GR r :
2
GR r :
1
3:206
= ,
prel r r r
1 2 3
= ,
prel r r r
1 2 3
= ,
prel r r r
1 2 3

Pcmp Relations

Parallel Compare Examples

> > > > > >
T F T T F F
ff 00 ff ff 00 00 00
pcmp1.gt
GR r :
3
GR r :
2
True
GR r :
1
is set to all ones. If the
r
1
Compare Relation (r
r == r
2 3
r > r (signed)
2 3
GR r :
3
GR r :
2
> > =
True
F T
GR r :
0xffff
ff
1
= =
False
0xffffffff 0x00000000
pcmp4.eq
one_byte_form
two_byte_form
four_byte_form
is set to all
r
1
prel
r )
2 3
= = =
False True True
0x0000 0xffff 0xffff
pcmp2.eq
Volume 3: Instruction Reference
A9
A9
A9
r
2