asm volatile("":::"memory) uncertainty.

[Andrew Haley]

On 16/05/16 04:51, Tom Udale wrote:
> My main fear is that the optimizer will look at the empty assembly "" 
> block and say "wait a minute, nothing is happening in there, how can it 
> possibly jump"?

It won't: GCC does not inspect asms to see if they do anything.
Besides, if you are really worried about that you can put a "do
nothing" comment into the asm.

I think your reasoning about asm goto is sound.  The only real
problem you'll have is that GCC will to remove statements which it
knows have no side effects.

Andrew.