[llvm] [GlobalIsel] Combine G_ADD and G_SUB with constants (PR #97771)

[Amara Emerson via llvm-commits]

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aemerson wrote:

That's true but implementing things that don't make any impact isn't going to get us closer at all. I'll do a build of the entire test suite to see what impact there is.

Our geomean deficit on Os is around 0.4-0.5% which suggests there are still relevant optimizations we can do that will noticeably move the needle.

I plan on starting work on that again soon but it's faster if we all align on the strategy instead of throwing darts at the wall.

https://github.com/llvm/llvm-project/pull/97771