[llvm] [X86] Avoid repeated map lookups (NFC) (PR #127374)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/127374.diff


1 Files Affected:

- (modified) llvm/lib/Target/X86/X86LowerAMXType.cpp (+2-2) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86LowerAMXType.cpp b/llvm/lib/Target/X86/X86LowerAMXType.cpp
index cb6127fb85749..2ea78d44d67cf 100644
--- a/llvm/lib/Target/X86/X86LowerAMXType.cpp
+++ b/llvm/lib/Target/X86/X86LowerAMXType.cpp
@@ -190,8 +190,8 @@ Value *ShapeCalculator::getRowFromCol(Instruction *II, Value *V,
 
 Value *ShapeCalculator::getColFromRow(Instruction *II, Value *V,
                                       unsigned Granularity) {
-  if (Row2Col.count(V))
-    return Row2Col[V];
+  if (auto It = Row2Col.find(V); It != Row2Col.end())
+    return It->second;
   IRBuilder<> Builder(II);
   Value *RealCol = nullptr;
   if (isa<ConstantInt>(V))

``````````

</details>


https://github.com/llvm/llvm-project/pull/127374