[llvm] fa9fb2a - [CodeGen] Avoid repeated hash lookups (NFC) (#123447)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-01-18T09:44:23-08:00
New Revision: fa9fb2ae94b58828ece7e78140ab8e1047adf0bb

URL: https://github.com/llvm/llvm-project/commit/fa9fb2ae94b58828ece7e78140ab8e1047adf0bb
DIFF: https://github.com/llvm/llvm-project/commit/fa9fb2ae94b58828ece7e78140ab8e1047adf0bb.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#123447)

Added: 
    

Modified: 
    llvm/lib/CodeGen/MachineSink.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/MachineSink.cpp b/llvm/lib/CodeGen/MachineSink.cpp
index 3c816f97650901..03d93cecaa5963 100644
--- a/llvm/lib/CodeGen/MachineSink.cpp
+++ b/llvm/lib/CodeGen/MachineSink.cpp
@@ -1784,11 +1784,12 @@ bool MachineSinking::SinkInstruction(MachineInstr &MI, bool &SawStore,
   for (auto &MO : MI.all_defs()) {
     if (!MO.getReg().isVirtual())
       continue;
-    if (!SeenDbgUsers.count(MO.getReg()))
+    auto It = SeenDbgUsers.find(MO.getReg());
+    if (It == SeenDbgUsers.end())
       continue;
 
     // Sink any users that don't pass any other DBG_VALUEs for this variable.
-    auto &Users = SeenDbgUsers[MO.getReg()];
+    auto &Users = It->second;
     for (auto &User : Users) {
       MachineInstr *DbgMI = User.getPointer();
       if (User.getInt()) {