[llvm-dev] llvm-mca for in-order CPUs (was Re: LLVM Weekly - #375, March 8th 2021)

[Jay Foad via llvm-dev]

On Mon, 8 Mar 2021 at 18:33, LLVM Weekly <list at llvmweekly.org> wrote:
> * The llvm-mca static performance analysis tool now support in-order CPUs such
>   as the Arm Cortex-A55. [d791695](https://reviews.llvm.org/rGd791695cb517).

Thanks for doing this! I am very interested in using it for the AMDGPU
target. Have you given any thought to targets with
MicroOpBufferSize=1? I understand that these are also "in order". I
found that I could get some tests running with these changes:
https://reviews.llvm.org/differential/diff/329308/

But I am really shooting in the dark here. I don't have a good
understanding of the difference between MicroOpBufferSize=0 and 1, and
I am not even sure which setting is really best for AMDGPU.

Thanks,
Jay.