[cfe-dev] [llvm-dev] MLIR for clang

Prashanth N R via cfe-dev cfe-dev at lists.llvm.org
Mon Feb 17 09:24:26 PST 2020

Fred Chow is a well known name in compiler community. He was the architect
of Open64 compiler.
His comment on LLVM IR from open64 mailing list can be seen at :
" From their name, LLVM roughly corresponds to Low WHIRL. I wonder how

LLVM tackles the compilation problems Open64 has tackled.  People with
exposure to LLVM are welcome to chime in."

On Mon, Feb 17, 2020 at 10:43 PM Prashanth N R <prashanth.nr at gmail.com>

> Currently LLVM uses a low level IR for representing programs. Memory
> disambiguation does not happen accurately for constructs like
> multi-dimensional arrays.  One of the ways we alleviate the same in LLVM
> currently is by using multiversioning of the code. By supporting a
> mid-level IR like MLIR we intend to keep the access indices of
> multidimensional array and do better disambiguation.
> thanks,
> -Prashanth
> On Sun, Feb 16, 2020 at 4:34 PM Nicolai Hähnle <nhaehnle at gmail.com> wrote:
>> Hi Prashanth,
>> On Sun, Feb 16, 2020 at 10:22 AM Prashanth N R via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>> >>   Starting from May-June, we at "Compiler Tree" would  start porting
>> clang compiler to use MLIR as middle end target. If someone has already
>> started a similar effort we would love to collaborate with them. If someone
>> would like to work with us, we are ready to form a group and collaborate.
>> If there are sharing opportunities from Fortran side, we would like to
>> consider the same.\
>> That's a rather vague statement, considering the flexibility of MLIR.
>> Could you explain your plans in more detail, and what specifically you
>> hope to achieve with them?
>> Cheers,
>> Nicolai
>> >>
>> >>    We are in the early phase of design for "C" part of the work. From
>> our experience with (FC+MLIR) compiler, we are estimating that we would
>> have an early cut of the compiler working with non-trivial workload within
>> a quarter of starting of work.
>> >>
>> >>   Please ping me for any queries or concerns.
>> >>
>> >> Regards,
>> >> -Prashanth
>> >
>> > _______________________________________________
>> > LLVM Developers mailing list
>> > llvm-dev at lists.llvm.org
>> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> --
>> Lerne, wie die Welt wirklich ist,
>> aber vergiss niemals, wie sie sein sollte.
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