Fast 24-bit array -> 32-bit array conversion?

Question

Quick Summary:

I have an array of 24-bit values. Any suggestion on how to quickly expand the individual 24-bit array elements into 32-bit

Answer 1

SSE 4.1 .ASM:

PINSRD  XMM0,  DWORD PTR[ESI],   0
PINSRD  XMM0,  DWORD PTR[ESI+3], 1
PINSRD  XMM0,  DWORD PTR[ESI+6], 2
PINSRD  XMM0,  DWORD PTR[ESI+9], 3
PSLLD   XMM0,  8                    
PSRLD   XMM0,  8
MOVNTDQ [EDI], XMM1
add     ESI,   12
add     EDI,   16