[llvm] [X86] Avoid repeated hash lookups (NFC) (PR #130393)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/130393

None

>From cfac2c48f82bb146d13c8d66da20b46161883fe6 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 7 Mar 2025 01:05:35 -0800
Subject: [PATCH] [X86] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Target/X86/X86PreTileConfig.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/X86/X86PreTileConfig.cpp b/llvm/lib/Target/X86/X86PreTileConfig.cpp
index e8d90da1fb1e0..f2ec4369a5ca4 100644
--- a/llvm/lib/Target/X86/X86PreTileConfig.cpp
+++ b/llvm/lib/Target/X86/X86PreTileConfig.cpp
@@ -400,8 +400,9 @@ bool X86PreTileConfig::runOnMachineFunction(MachineFunction &MF) {
     // A given point might be forked due to shape conditions are not met.
     for (MIRef I : InsertPoints) {
       // Make sure we insert ldtilecfg after the last shape def in MBB.
-      if (ShapeBBs.count(I.MBB) && I < ShapeBBs[I.MBB].back())
-        I = ShapeBBs[I.MBB].back();
+      auto It = ShapeBBs.find(I.MBB);
+      if (It != ShapeBBs.end() && I < It->second.back())
+        I = It->second.back();
       // There're chances the MBB is sunk more than once. Record it to avoid
       // multi insert.
       if (VisitedOrInserted.insert(I).second) {