[Bug 162] New: GDC unable to de-virtualise method calls
Manu via D.gnu
d.gnu at puremagic.com
Sun Oct 26 16:47:20 PDT 2014
I fought and lost a massive argument spanning years about this.
There are very limited cases where the backend is able to do this
On 26 October 2014 20:37, via D.gnu <d.gnu at puremagic.com> wrote:
> Bug ID 162 <http://bugzilla.gdcproject.org/show_bug.cgi?id=162> Summary GDC
> unable to de-virtualise method calls Product GDC Version development
> Hardware All OS All Status NEW Severity enhancement Priority Normal
> Component gdc Assignee ibuclaw at gdcproject.org Reporter
> ibuclaw at gdcproject.org
> Currently we emit method calls as the following:
> *(c->__vptr + 40) (c, 1, 2, 3);
> Which translate directly into the following trees:
> indirect_ref(pointer_plus(component_ref(c, __vptr), 40))
> GCC provides a more simplistic tree code called obj_type_ref, which represents
> a virtual method lookup, and given the binfo structure we already pass to the
> backed, this would give a chance for the optimiser passes to statically
> determine the dynamic type of the object and devirtualise the call.
> obj_type_ref(component_ref(c, __vptr), c, 40)
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