Intel Itanium 9150M, Руководство пользователя, Страница: 255 / 420

3:246 Volume 3: Instruction Reference
shladdp4
shladdp4 — Shift Left and Add Pointer
Format: (
qp
) shladdp4
r
1
=
r
2
,
count
2
,
r
3
A2
Description:
The first source operand is shifted to the left by
count
2
bits and then is added to the
second source operand. The upper 32 bits of the result are forced to zero, and then bits
{31:30} of GR
r
3
are copied to bits {62:61} of the result. This result is placed in GR
r
1
.
The first operand can be shifted by 1, 2, 3, or 4 bits.
Operation: if (PR[ qp ]) {
check_target_register( r
1
);
tmp_res = (GR[ r
2
] << count
2
) + GR[ r
3
];
tmp_res = zero_ext(tmp_res{31:0}, 32);
tmp_res{62:61} = GR[
r
3
]{31:30};
GR[ r
1
] = tmp_res;
GR[ r
1
].nat = GR[ r
2
].nat || GR[ r
3
].nat;
}
Interruptions:
Illegal Operation fault
Figure 2-43. Shift Left and Add Pointer
GR r
3
:
GR r
1
:
GR r
2
:
+
0 0