[llvm] [X86] Avoid repeated hash lookups (NFC) (PR #129360)

[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/129360.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 2ea78d44d67cf..eacdc8a3f639a 100644
--- a/llvm/lib/Target/X86/X86LowerAMXType.cpp
+++ b/llvm/lib/Target/X86/X86LowerAMXType.cpp
@@ -154,8 +154,8 @@ class ShapeCalculator {
 
 Value *ShapeCalculator::getRowFromCol(Instruction *II, Value *V,
                                       unsigned Granularity) {
-  if (Col2Row.count(V))
-    return Col2Row[V];
+  if (auto It = Col2Row.find(V); It != Col2Row.end())
+    return It->second;
   IRBuilder<> Builder(II);
   Value *RealRow = nullptr;
   if (isa<ConstantInt>(V))

``````````

</details>


https://github.com/llvm/llvm-project/pull/129360