commit a5bbfcf0c9dd48e13951fdb35362e2e3d545dbad
author Kazu Hirata <kazu@google.com> Tue Mar 04 00:08:40 2025 -0800
committer GitHub <noreply@github.com> Tue Mar 04 00:08:40 2025 -0800
tree a8177e5e9197098bef0bbc36a87d4fa123a11f96
parent 2127af80fa46709a563ad7ecc400209f1640f96e

[GlobalISel] Avoid repeated hash lookups (NFC) (#129653)

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index d01de29..b85239e 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -252,8 +252,8 @@
 }
 
 int IRTranslator::getOrCreateFrameIndex(const AllocaInst &AI) {
-  auto MapEntry = FrameIndices.find(&AI);
-  if (MapEntry != FrameIndices.end())
+  auto [MapEntry, Inserted] = FrameIndices.try_emplace(&AI);
+  if (!Inserted)
     return MapEntry->second;
 
   uint64_t ElementSize = DL->getTypeAllocSize(AI.getAllocatedType());
@@ -263,7 +263,7 @@
   // Always allocate at least one byte.
   Size = std::max<uint64_t>(Size, 1u);
 
-  int &FI = FrameIndices[&AI];
+  int &FI = MapEntry->second;
   FI = MF->getFrameInfo().CreateStackObject(Size, AI.getAlign(), false, &AI);
   return FI;
 }