Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc,

[Alan Cox]

On Thu, 2002-08-08 at 23:40, Luca Barbieri wrote:
> > The compiler can cache the value in a register
> It shouldn't since it is volatile and the machine has instructions with
> memory operands.

I'm curious what part of C99 guarantees that it must generate

	add 1 to memory

not

	load memory
	add 1
	store memory

It certainly guarantees not to cache it for use next statement, but does
it actually persuade the compiler to use direct operations on memory ?

I'm not a C99 language lawyer but genuinely curious