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

[Kazu Hirata via llvm-commits]

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

None

>From bfa6a6fbc2ac3f830bc496bf0a9456ab16959fd5 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Thu, 27 Feb 2025 23:10:44 -0800
Subject: [PATCH] [X86] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Target/X86/X86LowerAMXType.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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))