> Thanks all for your replies. > I already found the RBIT-instruction. I also found out I need > to study > the arm assembly language ;-) > > But how do I get my variable ? Is that in some register ? Is > there any > documentation about such things ? Then I can use inline assembly. >
ARM has different ABI's. A pragmatic solution is to create a full pascal (inline if you like) function with the function signature you like and a dummy body, look at the assembler generated (use debug info whe compiling) and then insert your instructions. For example Function ReverseBits(b:byte):byte; Begin result:=b shl 2; End; Look at how result:=b shl 2 is implemented and you'll find immmedialy the registers used. Next you replace result:=b shl 2 with your asm block. Note that RBIT is a thumb 2 instruction. Ludo _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
