Anybody familiar with this instruction?
include \masm32\include\masm32rt.inc
.code
.686p
.xmm
StringToDwordSimd_s:
psMask OWORD 80808003808080028080800180808000h
psMaskW OWORD 80078006800580048003800280018000h
s2Mult OWORD 000003E8000000640000000A00000001h
s2MultW OWORD 000000000000000003E80064000A0001h ; xmm3=1, 10, 100, 1000, 10000=2710h
s2Sub dq 3030303030303030h
OPTION PROLOGUE:NONE ; 1000
OPTION EPILOGUE:NONE
StringToDwordSimd proc arg
pop eax ; get ret address
pop edx ; get string pointer
push eax ; save ret address
movups xmm0, [edx]
movlps xmm1, s2Sub
psubb xmm0, xmm1 ; xmm0=08070605 04030201
movups xmm3, s2MultW
movups xmm2, psMaskW
pshufb xmm0, xmm2 ; xmm0=00080007 00060005 00040003 00020001, xmm3=00000000 00000000 03E80064 000A0001
int 3
pmaddwd xmm0, xmm3 ; xmm3=00000000 00000000 03E80064 000A0001 ->21, 4300 instead of 1200+34
movd eax, xmm0 ; xmm0=00000000 00000000 000010CCh 00000015h
retn
StringToDwordSimd endp
StringToDwordSimd_endp:
OPTION PROLOGUE:PrologueDef
OPTION EPILOGUE:EpilogueDef
start:
push chr$("12345678")
call StringToDwordSimd
inkey str$(eax), " is the result"
end start