Intel Itanium 9150M, Руководство пользователя

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3:272 Volume 3: Instruction Reference
unpack
Operation: if (PR[ qp ]) {
check_target_register( r
1
);
if (one_byte_form) { // one-byte elements
x[0] = GR[ r
2
]{7:0}; y[0] = GR[ r
3
]{7:0};
x[1] = GR[ r
2
]{15:8}; y[1] = GR[ r
3
]{15:8};
x[2] = GR[ r
2
]{23:16}; y[2] = GR[ r
3
]{23:16};
x[3] = GR[ r
2
]{31:24}; y[3] = GR[ r
3
]{31:24};
x[4] = GR[ r
2
]{39:32}; y[4] = GR[ r
3
]{39:32};
x[5] = GR[ r
2
]{47:40}; y[5] = GR[ r
3
]{47:40};
x[6] = GR[ r
2
]{55:48}; y[6] = GR[ r
3
]{55:48};
x[7] = GR[ r
2
]{63:56}; y[7] = GR[ r
3
]{63:56};
if (high_form)
GR[ r
1
] = concatenate8( x[7], y[7], x[6], y[6],
x[5], y[5], x[4], y[4]);
else // low_form
GR[ r
1
] = concatenate8( x[3], y[3], x[2], y[2],
x[1], y[1], x[0], y[0]);
} else if (two_byte_form) { // two-byte elements
x[0] = GR[ r
2
]{15:0}; y[0] = GR[ r
3
]{15:0};
x[1] = GR[ r
2
]{31:16}; y[1] = GR[ r
3
]{31:16};
x[2] = GR[ r
2
]{47:32}; y[2] = GR[ r
3
]{47:32};
x[3] = GR[ r
2
]{63:48}; y[3] = GR[ r
3
]{63:48};
if (high_form)
GR[ r
1
] = concatenate4(x[3], y[3], x[2], y[2]);
else // low_form
GR[ r
1
] = concatenate4(x[1], y[1], x[0], y[0]);
} else { // four-byte elements
x[0] = GR[ r
2
]{31:0}; y[0] = GR[ r
3
]{31:0};
x[1] = GR[ r
2
]{63:32}; y[1] = GR[ r
3
]{63:32};
if (high_form)
GR[ r
1
] = concatenate2(x[1], y[1]);
else // low_form
GR[ r
1
] = concatenate2(x[0], y[0]);
}
GR[
r
1
].nat = GR[ r
2
].nat || GR[ r
3
].nat;
}
Interruptions:
Illegal Operation fault