On Sun, Nov 5, 2017 at 11:53 AM, Josh Poimboeuf <jpoim...@redhat.com> wrote:
>
> The GCC manual says:
>
> "asm statements that have no output operands, including asm goto
> statements, are implicitly volatile."
Hmm. Fair enough.
And the manual does say that it can merge and duplicate those asms
(and suggests using "%=" to generate a unique number, but I guess
"%c0" with __COUNTER__ is equivalent).
I think the gcc manual has changed. I'm pretty certain it used to say
that "volatile" asms would not be "moved significantly". They've
silently changed semantics before too, oh well.
Linus
