[flang-commits] [flang] [flang] Expand SUM(DIM=CONSTANT) into an hlfir.elemental. (PR #118556)

[Tom Eccles via flang-commits]

tblah wrote:

Hi @vzakhari, we have a regression of roughly 5% on exchange2_r from spec2017 since this patch. This was measured on an aws graviton 3 machine (Arm Neoverse-V1). The flags I used were `-Ofast -mcpu=native -flto`.

Would it be okay to revert this commit until the problem is solved? Please get in touch if I can help with reproducing this issue.

https://github.com/llvm/llvm-project/pull/118556