[llvm] [SimplifyCFG]: Switch on umin replaces default (PR #164097)

[via llvm-commits]

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@@ -7540,6 +7540,60 @@ static bool reduceSwitchRange(SwitchInst *SI, IRBuilder<> &Builder,
   return true;
 }
 
+/// Tries to transform the switch when the condition is umin and a constant.
+/// In that case, the default branch can be replaced by the constant's branch.
+/// For example:
+/// switch(umin(a, 3)) {
+/// case 0:
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dianqk wrote:

Sorry, I mean this can be 1, 2 with otherwise: https://alive2.llvm.org/ce/z/-Ltgv3.

https://github.com/llvm/llvm-project/pull/164097