[llvm] b2b267e - [CodeGen] Avoid repeated hash lookups (NFC) (#130543)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-09T23:15:32-07:00
New Revision: b2b267ea7a3b85f83977cc74ba79332e453aed82

URL: https://github.com/llvm/llvm-project/commit/b2b267ea7a3b85f83977cc74ba79332e453aed82
DIFF: https://github.com/llvm/llvm-project/commit/b2b267ea7a3b85f83977cc74ba79332e453aed82.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#130543)

Added: 
    

Modified: 
    llvm/lib/CodeGen/CodeGenPrepare.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 088062afab177..d5fbd4c380746 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -4672,8 +4672,8 @@ class TypePromotionHelper {
   static void addPromotedInst(InstrToOrigTy &PromotedInsts,
                               Instruction *ExtOpnd, bool IsSExt) {
     ExtType ExtTy = IsSExt ? SignExtension : ZeroExtension;
-    InstrToOrigTy::iterator It = PromotedInsts.find(ExtOpnd);
-    if (It != PromotedInsts.end()) {
+    auto [It, Inserted] = PromotedInsts.try_emplace(ExtOpnd);
+    if (!Inserted) {
       // If the new extension is same as original, the information in
       // PromotedInsts[ExtOpnd] is still correct.
       if (It->second.getInt() == ExtTy)
@@ -4684,7 +4684,7 @@ class TypePromotionHelper {
       // BothExtension.
       ExtTy = BothExtension;
     }
-    PromotedInsts[ExtOpnd] = TypeIsSExt(ExtOpnd->getType(), ExtTy);
+    It->second = TypeIsSExt(ExtOpnd->getType(), ExtTy);
   }
 
   /// Utility function to query the original type of instruction \p Opnd