[llvm] [AArch64] Materialize constants via fneg. (PR #80641)

[David Green via llvm-commits]

davemgreen wrote:

> Hi, looks like the test `rshrn_v4i64_32` is failing in `CodeGen/AArch64/neon-rshrn.ll` due to this patch.

Hi - are you sure that wasn't the updated tablegen patterns in #81960? They undo some of the changes made in this commit.
I will try and take a looks at the patch when I can - it otherwise looks like a good improvement.

https://github.com/llvm/llvm-project/pull/80641