[llvm] [InstCombine] Fold `A == MIN_INT ? MAX_INT : 0 - A` to `ssub_sat 0, A` (PR #194519)

[Yingwei Zheng via llvm-commits]

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@@ -510,6 +510,19 @@ inline api_pred_ty<is_maxsignedvalue> m_MaxSignedValue(const APInt *&V) {
   return V;
 }
 
+struct is_minsignedvalue {
+  bool isValue(const APInt &C) const { return C.isMinSignedValue(); }
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dtcxzyw wrote:

Use `m_SignMask` instead.


https://github.com/llvm/llvm-project/pull/194519