Am Mon, 02 Feb 2015 08:55:59 -0800 schrieb Andrei Alexandrescu <seewebsiteforem...@erdani.org>:
> On 2/2/15 8:42 AM, Johannes Pfau wrote: > > Again the problem is not volatileLoad/Store which > > translate to single instructions it's wrappers. > > So does the argument boil down to better inlining control and > enforcement? -- Andrei Mostyl that, but not only that. It's also necessary that the compiler knows after inlining that the address is a literal. Loading data from fixed literal addresses produces different, more efficient code than loading from an runtime address. As the function code will generally be written for runtime values the compiler must optimize after inlining to recognize the inlined code deals with literals. The GCC backend performs these optimizations only if optimization is enabled. We could always do this in the dmd frontend inliner but LDC and GDC don't/can't use the frontend inliner. That's lot of work given that pragma(address) is a simple, consistent solution and not even a real language change.
