Bit shift register for Siemens S7

[SimonGoldsworthy]

No, CAD changes the order of the bytes, not the bits.

 

[seppoalanen]

Why not load a dword and shift the whole dword. The MSB of the low word must be shifted into the low bit of the high word. It avoids the loop.

Shifting bits one at a time is not efficient.

Peter, like this ?

S7
DB???. DBD 0-8 is opened
DWORD: #SRCPointer; #TgtPointer
==================================
L 32
T #SrcPointer // point bit 32 (from 0)in bit-queye
L 33
T #TgtPointer // bit 33

L DBD[#SrcPointer]
T DBD[#TgtPointer]

L 0
T #SrcPointer // point bit 0 (from 0)in bit-queye
L 1
T #TgtPointer // bit 1

L DBD[#SrcPointer]
T DBD[#TgtPointer]

SET // sets RLO true
R DBX0.0