Merge pull request #2854 from hackcraft/fix_range_optimisation

stephentoub · stephentoub · commit 5059d97f782f · 2015-08-19T07:35:51.000-04:00
Bring back range optimisation, fixed for boundary case.
diff --git a/src/System.Linq/src/System/Linq/Enumerable.cs b/src/System.Linq/src/System/Linq/Enumerable.cs
@@ -1478,7 +1478,7 @@ public static IEnumerable<int> Range(int start, int count)
 
         private static IEnumerable<int> RangeIterator(int start, int count)
         {
-            for (int i = 0; i < count; i++) yield return start + i;
+            for (int end = start + count; start != end; start++) yield return start;
         }
 
         public static IEnumerable<TResult> Repeat<TResult>(TResult element, int count)

Original file line number	Diff line number	Diff line change
`@@ -1478,7 +1478,7 @@ public static IEnumerable<int> Range(int start, int count)`
`1478`	`1478`
`1479`	`1479`	`private static IEnumerable<int> RangeIterator(int start, int count)`
`1480`	`1480`	`{`
`1481`		`- for (int i = 0; i < count; i++) yield return start + i;`
	`1481`	`+ for (int end = start + count; start != end; start++) yield return start;`
`1482`	`1482`	`}`
`1483`	`1483`
`1484`	`1484`	`public static IEnumerable<TResult> Repeat<TResult>(TResult element, int count)`