Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1710

PACKUSWB—Pack with Unsigned Saturation
Opcode
0F 67 /r
Description
Packs and saturates 4 signed words from the destination operand (first operand) and 4
signed words from the source operand (second operand) into 8 unsigned bytes in the
destination operand (see
of an unsigned byte (that is, greater than FFH or less than 00H), the saturated byte
value of FFH or 00H, respectively, is stored into the destination.
The destination operand must be an MMX technology register; the source operand may
be either an MMX technology register or a quadword memory location.
Figure 3-4.
Operation
DEST(7..0)  SaturateSignedWordToUnsignedByte DEST(15..0);
DEST(15..8)  SaturateSignedWordToUnsignedByte DEST(31..16);
DEST(23..16)  SaturateSignedWordToUnsignedByte DEST(47..32);
DEST(31..24)  SaturateSignedWordToUnsignedByte DEST(63..48);
DEST(39..32)  SaturateSignedWordToUnsignedByte SRC(15..0);
DEST(47..40)  SaturateSignedWordToUnsignedByte SRC(31..16);
DEST(55..48)  SaturateSignedWordToUnsignedByte SRC(47..32);
DEST(63..56)  SaturateSignedWordToUnsignedByte SRC(63..48);
Flags Affected
None.
Additional Itanium System Environment Exceptions
Itanium Reg Faults Disabled FP Register Fault if PSR.dfl is 1, NaT Register Consumption
Itanium Mem FaultsVHPT Data Fault, Nested TLB Fault, Data TLB Fault, Alternate Data
4:408
Instruction
PACKUSWB mm, mm/m64
Figure 3-4). If the signed value of a word is beyond the range
Operation of the PACKUSWB Instruction
PACKUSWB mm, mm/m64
mm/m64
H G F E
H' G' F' E' D' C' B' A'
Abort.
TLB Fault, Data Page Not Present Fault, Data NaT Page Consumption
Abort, Data Key Miss Fault, Data Key Permission Fault, Data Access
Rights Fault, Data Access Bit Fault, Data Dirty Bit Fault
Volume 4: IA-32 Intel
Description
Pack and saturate 4 signed words from mm and 4 signed
words from mm/m64 into 8 unsigned bytes in mm .
mm
D C B A
mm
®
MMX™ Technology Instruction Reference
3006014