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

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/130543

None

>From baa34e215df072f8b1807b20a106d71b69c9cf38 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sun, 9 Mar 2025 00:51:39 -0800
Subject: [PATCH] [CodeGen] Avoid repeated hash lookups (NFC)

---
 llvm/lib/CodeGen/CodeGenPrepare.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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