From 6cb2a02a384aece45e35d6e92bdfd3d52785492f Mon Sep 17 00:00:00 2001
From: Krzysztof Parzyszek <kparzysz@quicinc.com>
Date: Fri, 14 Oct 2022 15:44:24 -0700
Subject: [PATCH] [Hexagon] Report if changes were made in HvxIdioms pass

This should fix
```
Pass modifies its input and doesn't report it: Hexagon Vector Combine
Pass modifies its input and doesn't report it UNREACHABLE executed at
[...hecks-debian/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1436!
```
---
 llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp b/llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp
index 4e16d4f..2dacfa3 100644
--- a/llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp
@@ -1342,6 +1342,7 @@ auto HvxIdioms::run() -> bool {
         RecursivelyDeleteTriviallyDeadInstructions(&*It, &HVC.TLI);
         It = StartOver ? B.rbegin()
                        : cast<Instruction>(New)->getReverseIterator();
+        Changed = true;
       }
     }
   }
-- 
2.7.4