On Mon, Oct 05, 2015 at 12:05:44PM +0200, Florian Weimer wrote: > >>>>> Maybe aligned(1) will do what you want? > >>>> > >>>> Interesting idea. Would this alter generated code? > >>> > >>> It shouldn't -- it can only increase alignment (not decrease it). > >> > >> Why do you think that? > > > > Because the documentation says so. Maybe it is wrong though, I didn't > > test it. If so, please file a bug. > > I see a difference on x86_64: > > @@ -3,7 +3,6 @@ > .LCOLDB0: > .text > .LHOTB0: > - .p2align 4,,15 > .globl f > .type f, @function > f: > > I don't think this is a bug because the manual says: > > “However, when you explicitly specify a function alignment this > overrides the effect of the '-falign-functions' […] option for this > function.” > > So I think this attribute isn't useful for this purpose. Looks like > we'd need a new attribute, as Jeff suggested. And even worse, for targets where minimum alignment is bigger than 1 (most risc targets), the compiler errors if you try to use aligned(1). :-( Segher
