[llvm] [LV][NFC]Simplify the structure and improve message of safe distance analysis for scalable vectorization. (PR #99487)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Alexey Bataev (alexey-bataev)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/99487.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/LoopVectorize.cpp (+5-8) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 40919c944d21f..7ca798a8b2d89 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -4197,14 +4197,11 @@ bool LoopVectorizationCostModel::isScalableVectorizationAllowed() {
     return false;
   }
 
-  if (!Legal->isSafeForAnyVectorWidth()) {
-    std::optional<unsigned> MaxVScale = getMaxVScale(*TheFunction, TTI);
-    if (!MaxVScale) {
-      reportVectorizationInfo(
-          "The target does not provide maximum vscale value.",
-          "ScalableVFUnfeasible", ORE, TheLoop);
-      return false;
-    }
+  if (!Legal->isSafeForAnyVectorWidth() && !getMaxVScale(*TheFunction, TTI)) {
+    reportVectorizationInfo("The target does not provide maximum vscale value "
+                            "for safe distance analysis.",
+                            "ScalableVFUnfeasible", ORE, TheLoop);
+    return false;
   }
 
   IsScalableVectorizationAllowed = true;

``````````

</details>


https://github.com/llvm/llvm-project/pull/99487