[llvm] [VPlan] Strip dead code in cst live-in match (NFC) (PR #159589)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Ramkumar Ramachandra (artagnon)

<details>
<summary>Changes</summary>

A live-in constant can never be of vector type.

---
Full diff: https://github.com/llvm/llvm-project/pull/159589.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h (-4) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h b/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
index 8f9ce7a74b58b..c7eeb79e79f6a 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
+++ b/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
@@ -109,10 +109,6 @@ template <typename Pred, unsigned BitWidth = 0> struct int_pred_ty {
     if (!V)
       return false;
     const auto *CI = dyn_cast<ConstantInt>(V);
-    if (!CI && V->getType()->isVectorTy())
-      if (const auto *C = dyn_cast<Constant>(V))
-        CI = dyn_cast_or_null<ConstantInt>(
-            C->getSplatValue(/*AllowPoison=*/false));
     if (!CI)
       return false;
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/159589