[llvm] [GVN] Invalidate ICF cache when clearing the instructions (PR #68145)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

<details>
<summary>Changes</summary>

This fixes #<!-- -->48805

/home/user/llvm-project/llvm/lib/Analysis/InstructionPrecedenceTracking.cpp:93: void llvm::InstructionPrecedenceTracking::validate(const llvm::BasicBlock *) const: Assertion `It->second == &Insn && "Cached first special instruction is wrong!"' failed.

---
Full diff: https://github.com/llvm/llvm-project/pull/68145.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Scalar/GVN.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index bc54846ccf0ad2d..f7a905c2e13c4d4 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -2799,6 +2799,7 @@ bool GVNPass::processBlock(BasicBlock *BB) {
       salvageDebugInfo(*I);
       removeInstruction(I);
     }
+    ICF->clear();
     InstrsToErase.clear();
 
     if (AtStart)

``````````

</details>


https://github.com/llvm/llvm-project/pull/68145