[llvm] [GlobalISel] Combine [S,U]SUBO (PR #116489)

Thorsten Schütt via llvm-commits llvm-commits at lists.llvm.org
Sat Nov 16 13:00:11 PST 2024


================
@@ -1901,6 +1907,13 @@ def cmp_combines: GICombineGroup<[
   redundant_binop_in_equality
 ]>;
 
+
+def artifact_combines: GICombineGroup<[
+  merge_combines,
+  match_addos,
----------------
tschuett wrote:

Well, the legalizer builds addos while narrowing, e.g., adds:
https://github.com/llvm/llvm-project/blob/764275949897533a4be0728250e69a94d228fbc5/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp#L6289

Maybe artifacts is too strict. I stated in the summary that we import addos and the legalizer builds while legalizing non addos.

https://github.com/llvm/llvm-project/pull/116489


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