Intel Itanium 9150M, Руководство пользователя, Страница: 222 / 420

Volume 3: Instruction Reference 3:213
pmpy
pmpy — Parallel Multiply
Format: (
qp
) pmpy2.r
r
1
=
r
2
,
r
3
right_form I2
(
qp
) pmpy2.l
r
1
=
r
2
,
r
3
left_form I2
Description:
Two signed 16-bit data elements of GR
r
2
are multiplied by the corresponding two
signed 16-bit data elements of GR
r
3
as shown in Figure 2-36 . The two 32-bit results
are placed in GR
r
1
.
Operation: if (PR[ qp ]) {
check_target_register( r
1
);
if (right_form) {
GR[ r
1
]{31:0} = sign_ext(GR[ r
2
]{15:0}, 16) *
sign_ext(GR[ r
3
]{15:0}, 16);
GR[ r
1
]{63:32} = sign_ext(GR[ r
2
]{47:32}, 16) *
sign_ext(GR[ r
3
]{47:32}, 16);
} else { // left_form
GR[ r
1
]{31:0} = sign_ext(GR[ r
2
]{31:16}, 16) *
sign_ext(GR[ r
3
]{31:16}, 16);
GR[ r
1
]{63:32} = sign_ext(GR[ r
2
]{63:48}, 16) *
sign_ext(GR[ r
3
]{63:48}, 16);
}
GR[ r
1
].nat = GR[ r
2
].nat || GR[ r
3
].nat;
}
Interruptions:
Illegal Operation fault
Figure 2-36. Parallel Multiply Operation
GR r
2
:
GR r
1
:
GR r
3
:
* *
pmpy2.r
GR r
2
:
GR r
1
:
GR r
3
:
* *
pmpy2.l