Hi,
2015-12-07 8:20 GMT+01:00 Tobias Burnus <[email protected]>:
> Always - or only with optimization?
>
Only with optimization.
> I wonder whether using
>
> __asm__ __volatile__ ("":::"memory");
>
> would be sufficient as it has a way lower overhead than
> __sync_synchronize().
>
>
> That would be something like:
>
> r = build_stmt (input_location, ASM_EXPR, string,
> output_operands, input_operands,
> clobbers, labels);
> ASM_VOLATILE_P (r) = 1;
>
> with string = "", output_operands = NULL_TREE, input_operands = NULL_TREE,
> clobbers = "memory" and labels = NULL_TREE. (Except that string+clobbers
> are trees and not char[].)
>
I'm going to try it. Thanks.
