Add Array benchmarks

Author: therealbnut

benchmark/single-source/DropLast.swift

@@ -69,3 +69,18 @@ public func run_DropLastAnySequence(_ N: Int) {
     }
   }
 }
+
+@inline(never)
+public func run_DropLastArray(_ N: Int) {
+  let s = Array(0 ..< sequenceCount)
+  for _ in 1...20*N {
+    for _ in 1...reps {
+      var result = 0
+      for element in s.dropLast(dropCount) {
+        result += element
+      }
+      CheckResults(result == sumCount, 
+        "IncorrectResults in DropLastArray: \(result) != \(sumCount)")
+    }
+  }
+}

benchmark/single-source/Suffix.swift

@@ -69,3 +69,17 @@ public func run_SuffixAnySequence(_ N: Int) {
   }
 }
 
+@inline(never)
+public func run_SuffixArray(_ N: Int) {
+  let s = Array(0 ..< sequenceCount)
+  for _ in 1...20*N {
+    for _ in 1...reps {
+      var result = 0
+      for element in s.suffix(suffixCount) {
+        result += element
+      }
+      CheckResults(result == sumCount, 
+        "IncorrectResults in SuffixArray: \(result) != \(sumCount)")
+    }
+  }
+}

benchmark/utils/main.swift

@@ -164,6 +164,7 @@ precommitTests = [
   "DictionarySwap": run_DictionarySwap,
   "DictionarySwapOfObjects": run_DictionarySwapOfObjects,
   "DropLastAnySequence": run_DropLastAnySequence,
+  "DropLastArray": run_DropLastArray,
   "DropLastCountableRange": run_DropLastCountableRange,
   "DropLastSequence": run_DropLastSequence,
   "ErrorHandling": run_ErrorHandling,
@@ -279,6 +280,7 @@ precommitTests = [
   "StringWalk": run_StringWalk,
   "StringWithCString": run_StringWithCString,
   "SuffixAnySequence": run_SuffixAnySequence,
+  "SuffixArray": run_SuffixArray,
   "SuffixCountableRange": run_SuffixCountableRange,
   "SuffixSequence": run_SuffixSequence,
   "SuperChars": run_SuperChars,