volatile registers

[Doug Gwyn]

In article <9316 at ihlpb.ATT.COM> nevin1 at ihlpb.UUCP (55528-Liber,N.J.) asks:
>Is it even possible to have a strictly conforming C program whose
>behavior would change by declaring any of its variables volatile?

Declaring a truly non-volatile object as "volatile" would not affect
the virtual-machine semantics, but it would in general have an effect
on code generation (and thus reduce execution speed, etc.).  That's
why it's not the default.