From 2623df180b9e86512fe69b8f90563fbd8add89c3 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Fri, 28 Aug 2026 23:59:37 +0800
Subject: [CodeGen] Complete LaneMask bitwise operations

---
 backend/lib/CodeGen/LiveRegUnits.cpp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'backend/lib/CodeGen/LiveRegUnits.cpp')

diff --git a/backend/lib/CodeGen/LiveRegUnits.cpp b/backend/lib/CodeGen/LiveRegUnits.cpp
index e0aa992..935478e 100644
--- a/backend/lib/CodeGen/LiveRegUnits.cpp
+++ b/backend/lib/CodeGen/LiveRegUnits.cpp
@@ -21,10 +21,6 @@
 namespace rcc {
 
 namespace {
-[[nodiscard]] LaneMask subtractLanes(LaneMask Left, LaneMask Right) noexcept {
-  return LaneMask::fromRaw(Left.rawValue() & ~Right.rawValue());
-}
-
 template <typename KeyT>
 void addLanes(std::unordered_map<KeyT, LaneMask> &Values, KeyT Key, LaneMask Lanes) {
   if (Lanes.empty())
@@ -34,7 +30,7 @@ void addLanes(std::unordered_map<KeyT, LaneMask> &Values, KeyT Key, LaneMask Lan
     Values.emplace(Key, Lanes);
     return;
   }
-  Position->second = Position->second | Lanes;
+  Position->second |= Lanes;
 }
 
 template <typename KeyT>
@@ -42,7 +38,7 @@ void removeLanes(std::unordered_map<KeyT, LaneMask> &Values, KeyT Key, LaneMask
   const auto Position = Values.find(Key);
   if (Position == Values.end() || Lanes.empty())
     return;
-  Position->second = subtractLanes(Position->second, Lanes);
+  Position->second &= ~Lanes;
   if (Position->second.empty())
     Values.erase(Position);
 }
-- 
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