[llvm-dev] [GlobalISel] gen-global-isel failed to work

[Alex Bradbury via llvm-dev]

On 20 December 2017 at 09:51, Leslie Zhai via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Sorry, I am apprentice of lowRISC, and meet new bug when porting GlobalISel
> to RISCV target
> https://github.com/xiangzhai/llvm/commit/b3f91ea54d9fee0ef7e73a32c6b8456bbe252811

Hi Leslie. You're going to run into a challenge with GlobalISel and
the RISC-V backend due to our use of variable-sized register classes
(http://lists.llvm.org/pipermail/llvm-dev/2016-September/105027.html).
I believe that neither GlobalISel or FastISel have been updated to
support this concept.

Best,

Alex