Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1119

psad
psad — Parallel Sum of Absolute Difference
( ) psad1
Format: qp
The unsigned 8-bit elements of GR
Description:
of GR . The absolute value of each difference is accumulated across the elements and
r
3
placed in GR
Figure 2-38.
3:220
= ,
r r r
1 2 3
.
r
1
Parallel Sum of Absolute Difference Example
GR r :
3
GR r :
2
-
abs
GR r :
1
are subtracted from the unsigned 8-bit elements
r
2
- - - - - -
abs abs abs abs
abs abs abs
+ + +
+
psad1
-
+
+
+
Volume 3: Instruction Reference
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