On Wednesday, 19 August 2015 at 09:55:19 UTC, Dmitry Olshansky
wrote:
On 19-Aug-2015 12:46, "Ola Fosheim =?UTF-8?B?R3LDuHN0YWQi?=
<[email protected]>" wrote:
Well, you can start on this now, but by the time it is ready
and
hardened, LLVM might have received improved AVX2 and AVX-512
code gen
from Intel. Which basically will leave DMD in the dust.
On numerics, video-codecs and the like. Not like compilers
solely depend on AVX.
Compilers are often written for scalars, but they are also just
one benchmark that compilers are evaluated by.
DMD could use multiple backends, use it's own
performance-estimator (ran on generated code) and pick the best
output from each backend.
D could leverage increased register sizes for parameter transfer
between non-C callable functions. Just that alone could be
beneficial. Clearly having 256/512 bit wide registers matters.
And you need to coordinate how the packing is done so you don't
have to shuffle.
Lots of options in there, but you need to be different from LLVM.
You can't just take an old SSA and improve on it.
Another option is to take the C++ to D converter used for
building DDMD and see if it can be extended to work on LLVM.
