[llvm] fb19bdd - [SPIRV] Avoid repeated hash lookups (NFC) (#128398)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-23T01:04:11-08:00
New Revision: fb19bddbc5d55d80785709303df8d950a527f6e9

URL: https://github.com/llvm/llvm-project/commit/fb19bddbc5d55d80785709303df8d950a527f6e9
DIFF: https://github.com/llvm/llvm-project/commit/fb19bddbc5d55d80785709303df8d950a527f6e9.diff

LOG: [SPIRV] Avoid repeated hash lookups (NFC) (#128398)

Added: 
    

Modified: 
    llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h

Removed: 
    


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diff  --git a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
index c7f846b8e9bcc..2b3599259a739 100644
--- a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
+++ b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
@@ -197,12 +197,10 @@ struct ModuleAnalysisInfo {
   // Convert MBB's number to corresponding ID register.
   Register getOrCreateMBBRegister(const MachineBasicBlock &MBB) {
     auto Key = std::make_pair(MBB.getParent(), MBB.getNumber());
-    auto It = BBNumToRegMap.find(Key);
-    if (It != BBNumToRegMap.end())
-      return It->second;
-    Register NewReg = Register::index2VirtReg(getNextID());
-    BBNumToRegMap[Key] = NewReg;
-    return NewReg;
+    auto [It, Inserted] = BBNumToRegMap.try_emplace(Key);
+    if (Inserted)
+      It->second = Register::index2VirtReg(getNextID());
+    return It->second;
   }
 };
 } // namespace SPIRV