[llvm] 22bc029 - [CodeGen] Avoid repeated hash lookups (NFC) (#125463)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-03T12:29:34-08:00
New Revision: 22bc029e2be51951e2be749bf89a1087beb265b1

URL: https://github.com/llvm/llvm-project/commit/22bc029e2be51951e2be749bf89a1087beb265b1
DIFF: https://github.com/llvm/llvm-project/commit/22bc029e2be51951e2be749bf89a1087beb265b1.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#125463)

Added: 
    

Modified: 
    llvm/include/llvm/CodeGen/LiveIntervals.h

Removed: 
    


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diff  --git a/llvm/include/llvm/CodeGen/LiveIntervals.h b/llvm/include/llvm/CodeGen/LiveIntervals.h
index 540651ea114427c..708917be497ef69 100644
--- a/llvm/include/llvm/CodeGen/LiveIntervals.h
+++ b/llvm/include/llvm/CodeGen/LiveIntervals.h
@@ -149,8 +149,9 @@ class LiveIntervals {
   LiveInterval &createEmptyInterval(Register Reg) {
     assert(!hasInterval(Reg) && "Interval already exists!");
     VirtRegIntervals.grow(Reg.id());
-    VirtRegIntervals[Reg.id()] = createInterval(Reg);
-    return *VirtRegIntervals[Reg.id()];
+    auto &Interval = VirtRegIntervals[Reg.id()];
+    Interval = createInterval(Reg);
+    return *Interval;
   }
 
   LiveInterval &createAndComputeVirtRegInterval(Register Reg) {
@@ -168,8 +169,9 @@ class LiveIntervals {
 
   /// Interval removal.
   void removeInterval(Register Reg) {
-    delete VirtRegIntervals[Reg];
-    VirtRegIntervals[Reg] = nullptr;
+    auto &Interval = VirtRegIntervals[Reg];
+    delete Interval;
+    Interval = nullptr;
   }
 
   /// Given a register and an instruction, adds a live segment from that