On Thursday, 12 November 2015 at 21:24:30 UTC, David Nadlinger
wrote:
On Thursday, 12 November 2015 at 21:16:25 UTC, Walter Bright
wrote:
[...]
Oh, GCC has had similar notions as a non-standard attribute for
ages, and LLVM since its inception.
At least for LDC, the reason why we do not currently lower many
of the qualifiers like pure, nothrow, immutable, etc. is that
LLVM will ruthlessly consider your code to exhibit undefined
behavior if you try to be clever and violate them, subsequently
optimizing based on that. In other words, if you cast away
const/immutable and modify a variable, for instance, you might
find that the entire function body magically disappears under
your feet.
Maybe it is time to revisit this, though, but last time I tried
it broke druntime/Phobos in a couple of places.
That sounds awesome.
Maybe only enable it for @safe code?
