================
@@ -188,7 +188,11 @@ enum RegBankLLTMappingApplyID {
 
   Sgpr32Trunc,
 
-  // Src only modifiers: waterfalls, extends
+  // Src only modifiers: execute in waterfall loop if divergent
+  Sgpr32_W,
----------------
Pierre-vh wrote:

nit: use a suffix like `_WF` for WaterFall?
I keep thinking this is meant to say "wide" for some reason; maybe it's just me

https://github.com/llvm/llvm-project/pull/145912
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