[llvm] [DebugInfo] Avoid repeated hash lookups (NFC) (PR #112298)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/112298

None

>From c326c3d76eeb1cee0e42075ab15cb6ca01b77d04 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Mon, 14 Oct 2024 07:11:32 -0700
Subject: [PATCH] [DebugInfo] Avoid repeated hash lookups (NFC)

---
 llvm/lib/DebugInfo/PDB/Native/SymbolCache.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/DebugInfo/PDB/Native/SymbolCache.cpp b/llvm/lib/DebugInfo/PDB/Native/SymbolCache.cpp
index 1a31aa206dfcc6..463b9ebe3cbff5 100644
--- a/llvm/lib/DebugInfo/PDB/Native/SymbolCache.cpp
+++ b/llvm/lib/DebugInfo/PDB/Native/SymbolCache.cpp
@@ -447,11 +447,11 @@ SymbolCache::findPublicSymbolBySectOffset(uint32_t Sect, uint32_t Offset) {
 std::vector<SymbolCache::LineTableEntry>
 SymbolCache::findLineTable(uint16_t Modi) const {
   // Check if this module has already been added.
-  auto LineTableIter = LineTable.find(Modi);
-  if (LineTableIter != LineTable.end())
+  auto [LineTableIter, Inserted] = LineTable.try_emplace(Modi);
+  if (!Inserted)
     return LineTableIter->second;
 
-  std::vector<LineTableEntry> &ModuleLineTable = LineTable[Modi];
+  std::vector<LineTableEntry> &ModuleLineTable = LineTableIter->second;
 
   // If there is an error or there are no lines, just return the
   // empty vector.