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

[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/130393.diff


1 Files Affected:

- (modified) llvm/lib/Target/X86/X86PreTileConfig.cpp (+3-2) 


``````````diff
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) {

``````````

</details>


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