From 40bb7dba671139e912036f77c0606e3c8f16d2af Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Sun, 22 Jan 2023 16:41:15 +0000
Subject: [PATCH 1/2] Remove `RangeIterator.ToArray` bounds check

https://github.com/dotnet/runtime/pull/80633#discussion_r1082720454
---
 src/libraries/System.Linq/src/System/Linq/Range.SpeedOpt.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libraries/System.Linq/src/System/Linq/Range.SpeedOpt.cs b/src/libraries/System.Linq/src/System/Linq/Range.SpeedOpt.cs
index dba2dbb7ec39eb..6704eef5dedc29 100644
--- a/src/libraries/System.Linq/src/System/Linq/Range.SpeedOpt.cs
+++ b/src/libraries/System.Linq/src/System/Linq/Range.SpeedOpt.cs
@@ -18,7 +18,7 @@ public int[] ToArray()
             {
                 int[] array = new int[_end - _start];
                 int cur = _start;
-                for (int i = 0; i != array.Length; ++i)
+                for (int i = 0; i < array.Length; ++i)
                 {
                     array[i] = cur;
                     ++cur;

From ba73b332d14dba7e9754399d008e45cc973a3fd4 Mon Sep 17 00:00:00 2001
From: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
Date: Sun, 22 Jan 2023 19:54:43 +0000
Subject: [PATCH 2/2] Eliminate additional `ToArray` bounds checks

---
 .../System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs   | 2 +-
 src/libraries/System.Linq/src/System/Linq/Partition.SpeedOpt.cs | 2 +-
 src/libraries/System.Linq/src/System/Linq/Select.SpeedOpt.cs    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs b/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs
index 6ea4b069a1e9ae..c8861e176f03b0 100644
--- a/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs
+++ b/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs
@@ -21,7 +21,7 @@ public virtual TElement[] ToArray()
 
             TElement[] array = new TElement[count];
             int[] map = SortedMap(buffer);
-            for (int i = 0; i != array.Length; i++)
+            for (int i = 0; i < array.Length; i++)
             {
                 array[i] = buffer._items[map[i]];
             }
diff --git a/src/libraries/System.Linq/src/System/Linq/Partition.SpeedOpt.cs b/src/libraries/System.Linq/src/System/Linq/Partition.SpeedOpt.cs
index c46465f82547b3..8555fa1582d298 100644
--- a/src/libraries/System.Linq/src/System/Linq/Partition.SpeedOpt.cs
+++ b/src/libraries/System.Linq/src/System/Linq/Partition.SpeedOpt.cs
@@ -254,7 +254,7 @@ public TSource[] ToArray()
                 }
 
                 TSource[] array = new TSource[count];
-                for (int i = 0, curIdx = _minIndexInclusive; i != array.Length; ++i, ++curIdx)
+                for (int i = 0, curIdx = _minIndexInclusive; i < array.Length; ++i, ++curIdx)
                 {
                     array[i] = _source[curIdx];
                 }
diff --git a/src/libraries/System.Linq/src/System/Linq/Select.SpeedOpt.cs b/src/libraries/System.Linq/src/System/Linq/Select.SpeedOpt.cs
index 8ca02c76b08df2..76ee67b2dcbdb7 100644
--- a/src/libraries/System.Linq/src/System/Linq/Select.SpeedOpt.cs
+++ b/src/libraries/System.Linq/src/System/Linq/Select.SpeedOpt.cs
@@ -789,7 +789,7 @@ public TResult[] ToArray()
                 }
 
                 TResult[] array = new TResult[count];
-                for (int i = 0, curIdx = _minIndexInclusive; i != array.Length; ++i, ++curIdx)
+                for (int i = 0, curIdx = _minIndexInclusive; i < array.Length; ++i, ++curIdx)
                 {
                     array[i] = _selector(_source[curIdx]);
                 }