[llvm] [LV] Repalce dead invalidateCostModelingDecisions with assert (NFC) (PR #190837)

[Florian Hahn via llvm-commits]

https://github.com/fhahn created https://github.com/llvm/llvm-project/pull/190837

Replace dead invalidateCostModelingDecisions with assertion that no decisions have been taken yet.

>From 45afc75df5112d522b24fe8e4be898283e883b24 Mon Sep 17 00:00:00 2001
From: Florian Hahn <flo at fhahn.com>
Date: Fri, 3 Apr 2026 17:31:07 +0100
Subject: [PATCH] [LV] Repalce dead invalidateCostModelingDecisions with assert
 (NFC)

Replace dead invalidateCostModelingDecisions with assertion that no
decisions have been taken yet.
---
 llvm/lib/Transforms/Vectorize/LoopVectorize.cpp | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index e907b5621b817..adf28024df467 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -3796,12 +3796,10 @@ ElementCount LoopVectorizationCostModel::getMaximizedVFForTarget(
     MaxVF =
         clampVFByMaxTripCount(MaxVF, MaxTripCount, UserIC, FoldTailByMasking);
 
-    if (MaxVectorElementCount != MaxVF) {
-      // Invalidate any widening decisions we might have made, in case the loop
-      // requires prediction (decided later), but we have already made some
-      // load/store widening decisions.
-      invalidateCostModelingDecisions();
-    }
+    assert(MaxVectorElementCount == MaxVF ||
+           (WideningDecisions.empty() && CallWideningDecisions.empty() &&
+            Uniforms.empty() && Scalars.empty()) &&
+               "No decisions should have been taken at this point");
   }
   return MaxVF;
 }