On Wed, 15 Aug 2007, Satyam Sharma wrote:
> (C)
> $ cat tp3.c
> int a;
>
> void func(void)
> {
> *(volatile int *)&a = 10;
> *(volatile int *)&a = 20;
> }
> $ gcc -Os -S tp3.c
> $ cat tp3.s
> ...
> movl $10, a
> movl $20, a
> ...
I'm curious about one minor tangential point. Why, instead of:
b = *(volatile int *)&a;
why can't this just be expressed as:
b = (volatile int)a;
Isn't it the contents of a that's volatile, i.e. it's value can change
invisibly to the compiler, and that's why you want to force a read from
memory? Why do you need the "*(volatile int *)&" construct?
-Bill
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