[sdcc-devel]optimizations

[Johan K. <joh...@id...>]

Slowly but certainly I am undressing optimizations where they are too
agressive. E.g. in the JanVanBelle case:

sfr at 0x80 P6;

extern void LCD_PutCommand(int);

void LCD_PutChar (unsigned char karakter) {
   LCD_PutCommand(0x1234);
   P6 = karakter;
}

where P6 is assigned before the function call because packregsForAssign()
decided that the iTemp could be skipped because it is not a parameter of the
function call.

I am doing these fixes only for the mcs51 and ds390 port because I can test
them, but some off them should also be done for other ports.
In fact most of the optimizations done in <port>/ralloc.c should be moved to
a higher level because they are not port specific.

Johan

P.S. I haven't said that I will do that :)