CPU: all which supported IA MMX:
Pentium (P55C only), Pentium (tm) Pro (P6) future models
Type of Instruction: User

Instruction: PUNPCKHDQ dest,src


dest[63..32] <- src[63..32]
dest[31..0] <- dest[63..32]

Note: This instruction unpack and interleave the high-order data elements
of the destination and source operands into the destination operand.
The low-order data elements are ignored.
When unpacking from a memory operand, the full 64-bit operand is
accessed from memory. The instruction uses only the high-order 32 bits.
If the source operand is all zeros, the result is a zero extension of
the high-order elements of the destination operand.

Flags affected: None


RM PM VM SMM Description
#GP(0) If Illegal memory operand's EA in CS,DS,ES,FS,GS
#SS(0) If illegal memory operand's EA in SS
#PF(fcode) If page fault
#AC #AC If unaligned memory reference then alignment
check enabled and in ring 3.
#UD #UD #UD #UD If CR0.EM = 1
#NM #NM #NM #NM If CR0.TS = 1
#MF #MF #MF #MF If pending FPU Exception
#13 #13 If any part of the the operand lies outside of
the EA space from 0 to FFFFH
COP & Times:

PUNPCKHDQ mm,mm/m64 0FH 6AH PostByte

P55C: n/a
future P6: n/a

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