On Thu, Dec 12, 2002 at 09:41:52AM -0500, Dan Espen wrote:
> > Maybe using bit fileds isn't this clever at all. Sure it saves
> > several hundred bytes per window, but we pay this with additional
> > code and slower execution.
>
> If I remember correctly, we checked the code generated by the compilers
> and bit field access generated code comparable to byte access.
But not when writing a bit. To write a whole byte, the compiler
can just put the value into the byte. But to write a single bit
in a bit filed structure a la
struct
{
unsigned is_foo : 1;
unsigned has_bar : 1;
} flags;
It has to read the corresponding byte, set or delete the target
bit, then write it back. At least if the assembler does not
support atomic bit operations.
Bye
Dominik ^_^ ^_^
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