switch var to let in benchmark directory

benchmark/single-source/AngryPhonebook.swift

@@ -21,7 +21,7 @@ public let AngryPhonebook = BenchmarkInfo(
   tags: [.validation, .api, .String],
   legacyFactor: 7)
 
-var words = [
+let words = [
   "James", "John", "Robert", "Michael", "William", "David", "Richard", "Joseph",
   "Charles", "Thomas", "Christopher", "Daniel", "Matthew", "Donald", "Anthony",
   "Paul", "Mark", "George", "Steven", "Kenneth", "Andrew", "Edward", "Brian",

benchmark/single-source/AnyHashableWithAClass.swift

@@ -22,7 +22,7 @@ import TestsUtils
 // 11% _swift_stdlib_makeAnyHashableUpcastingToHashableBaseType
 // 16% _swift_retain_[n]
 //  5% swift_conformsToProtocol
-public var AnyHashableWithAClass = BenchmarkInfo(
+public let AnyHashableWithAClass = BenchmarkInfo(
   name: "AnyHashableWithAClass",
   runFunction: run_AnyHashableWithAClass,
   tags: [.abstraction, .runtime, .cpubench],

benchmark/single-source/ArrayOfGenericPOD.swift

@@ -76,7 +76,7 @@ public func run_ArrayOfGenericPOD(_ N: Int) {
 
 // --- ArrayInitFromSlice
 
-var globalArray = Array<UInt8>(repeating: 0, count: 4096)
+let globalArray = Array<UInt8>(repeating: 0, count: 4096)
 
 func createArrayOfPOD() {
   blackHole(globalArray)

benchmark/single-source/ArraySetElement.swift

@@ -15,7 +15,7 @@ import TestsUtils
 // 33% isUniquelyReferenced
 //   15% swift_rt_swift_isUniquelyReferencedOrPinned_nonNull_native
 //   18% swift_isUniquelyReferencedOrPinned_nonNull_native
-public var ArraySetElement = BenchmarkInfo(
+public let ArraySetElement = BenchmarkInfo(
   name: "ArraySetElement",
   runFunction: run_ArraySetElement,
   tags: [.runtime, .cpubench]

benchmark/single-source/ChainedFilterMap.swift

@@ -1,6 +1,6 @@
 import TestsUtils
 
-public var ChainedFilterMap = [
+public let ChainedFilterMap = [
   BenchmarkInfo(name: "ChainedFilterMap", runFunction: run_ChainedFilterMap,
     tags: [.algorithm], setUpFunction: { blackHole(first100k) },
     legacyFactor: 9),

benchmark/single-source/Chars.swift

@@ -20,7 +20,7 @@ public let Chars = BenchmarkInfo(
   setUpFunction: { blackHole(alphabetInput) },
   legacyFactor: 50)
 
-var alphabetInput: [Character] = [
+let alphabetInput: [Character] = [
     "A", "B", "C", "D", "E", "F", "G",
     "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
     "S", "T", "U",

benchmark/single-source/Hash.swift

@@ -127,7 +127,7 @@ class Hash {
 final
 class MD5 : Hash {
   // Integer part of the sines of integers (in radians) * 2^32.
-  var k : [UInt32] = [0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee ,
+  let k : [UInt32] = [0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee ,
                       0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501 ,
                       0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be ,
                       0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821 ,
@@ -145,7 +145,7 @@ class MD5 : Hash {
                       0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 ]
 
   // Per-round shift amounts
-  var r : [UInt32] = [7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
+  let r : [UInt32] = [7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
                       5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20,
                       4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
                       6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21]
@@ -433,7 +433,7 @@ class SHA256 :  Hash {
   var h6: UInt32 = 0
   var h7: UInt32 = 0
 
-  var k : [UInt32] = [
+  let k : [UInt32] = [
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,

benchmark/single-source/LuhnAlgoEager.swift

@@ -5,7 +5,7 @@
 
 import TestsUtils
 
-public var LuhnAlgoEager = BenchmarkInfo(
+public let LuhnAlgoEager = BenchmarkInfo(
   name: "LuhnAlgoEager",
   runFunction: run_LuhnAlgoEager,
   tags: [.algorithm]

benchmark/single-source/LuhnAlgoLazy.swift

@@ -5,7 +5,7 @@
 
 import TestsUtils
 
-public var LuhnAlgoLazy = BenchmarkInfo(
+public let LuhnAlgoLazy = BenchmarkInfo(
   name: "LuhnAlgoLazy",
   runFunction: run_LuhnAlgoLazy,
   tags: [.algorithm]

benchmark/single-source/NibbleSort.swift

@@ -4,7 +4,7 @@
 
 import TestsUtils
 
-public var NibbleSort = BenchmarkInfo(
+public let NibbleSort = BenchmarkInfo(
   name: "NibbleSort",
   runFunction: run_NibbleSort,
   tags: [.validation],

benchmark/single-source/PolymorphicCalls.swift

@@ -22,7 +22,7 @@ applying a jump-threading in combination with the speculative devirtualization.
 
 import TestsUtils
 
-public var PolymorphicCalls = BenchmarkInfo(
+public let PolymorphicCalls = BenchmarkInfo(
   name: "PolymorphicCalls",
   runFunction: run_PolymorphicCalls,
   tags: [.abstraction, .cpubench]

benchmark/single-source/PopFront.swift

@@ -42,7 +42,7 @@ public func run_PopFrontArray(_ N: Int) {
 
 @inline(never)
 public func run_PopFrontUnsafePointer(_ N: Int) {
-  var orig = Array(repeating: 1, count: arrayCount)
+  let orig = Array(repeating: 1, count: arrayCount)
   let a = UnsafeMutablePointer<Int>.allocate(capacity: arrayCount)
   for _ in 1...N {
       for i in 0..<arrayCount {

benchmark/single-source/SevenBoom.swift

@@ -22,7 +22,7 @@ import Foundation
 //  7% objc_msgSend
 //  5% _swift_release_
 //  2% _swift_retain_
-public var SevenBoom = BenchmarkInfo(
+public let SevenBoom = BenchmarkInfo(
   name: "SevenBoom",
   runFunction: run_SevenBoom,
   tags: [.runtime, .exceptions, .bridging, .cpubench]

benchmark/single-source/SortStrings.swift

@@ -1050,7 +1050,7 @@ public func run_SortSortedStrings(_ N: Int) {
   }
 }
 
-var unicodeWords: [String] = [
+let unicodeWords: [String] = [
   "❄️woodshed",
   "❄️lakism",
   "❄️gastroperiodynia",

benchmark/single-source/StrComplexWalk.swift

@@ -20,7 +20,7 @@ public let StrComplexWalk = BenchmarkInfo(
 
 @inline(never)
 public func run_StrComplexWalk(_ N: Int) {
-  var s = "निरन्तरान्धकारिता-दिगन्तर-कन्दलदमन्द-सुधारस-बिन्दु-सान्द्रतर-घनाघन-वृन्द-सन्देहकर-स्यन्दमान-मकरन्द-बिन्दु-बन्धुरतर-माकन्द-तरु-कुल-तल्प-कल्प-मृदुल-सिकता-जाल-जटिल-मूल-तल-मरुवक-मिलदलघु-लघु-लय-कलित-रमणीय-पानीय-शालिका-बालिका-करार-विन्द-गलन्तिका-गलदेला-लवङ्ग-पाटल-घनसार-कस्तूरिकातिसौरभ-मेदुर-लघुतर-मधुर-शीतलतर-सलिलधारा-निराकरिष्णु-तदीय-विमल-विलोचन-मयूख-रेखापसारित-पिपासायास-पथिक-लोकान्"
+  let s = "निरन्तरान्धकारिता-दिगन्तर-कन्दलदमन्द-सुधारस-बिन्दु-सान्द्रतर-घनाघन-वृन्द-सन्देहकर-स्यन्दमान-मकरन्द-बिन्दु-बन्धुरतर-माकन्द-तरु-कुल-तल्प-कल्प-मृदुल-सिकता-जाल-जटिल-मूल-तल-मरुवक-मिलदलघु-लघु-लय-कलित-रमणीय-पानीय-शालिका-बालिका-करार-विन्द-गलन्तिका-गलदेला-लवङ्ग-पाटल-घनसार-कस्तूरिकातिसौरभ-मेदुर-लघुतर-मधुर-शीतलतर-सलिलधारा-निराकरिष्णु-तदीय-विमल-विलोचन-मयूख-रेखापसारित-पिपासायास-पथिक-लोकान्"
   let ref_result = 379
   for _ in 1...200*N {
     var count = 0

benchmark/single-source/StringComparison.swift

@@ -208,23 +208,23 @@ public let StringNormalization: [BenchmarkInfo] = [
   ),
 ]
 
-var Workload_ascii: Workload! = Workload.ascii
+let Workload_ascii: Workload! = Workload.ascii
 
-var Workload_latin1: Workload! = Workload.latin1
+let Workload_latin1: Workload! = Workload.latin1
 
-var Workload_fastPrenormal: Workload! = Workload.fastPrenormal
+let Workload_fastPrenormal: Workload! = Workload.fastPrenormal
 
-var Workload_slowerPrenormal: Workload! = Workload.slowerPrenormal
+let Workload_slowerPrenormal: Workload! = Workload.slowerPrenormal
 
-var Workload_nonBMPSlowestPrenormal: Workload! = Workload.nonBMPSlowestPrenormal
+let Workload_nonBMPSlowestPrenormal: Workload! = Workload.nonBMPSlowestPrenormal
 
-var Workload_emoji: Workload! = Workload.emoji
+let Workload_emoji: Workload! = Workload.emoji
 
-var Workload_abnormal: Workload! = Workload.abnormal
+let Workload_abnormal: Workload! = Workload.abnormal
 
-var Workload_zalgo: Workload! = Workload.zalgo
+let Workload_zalgo: Workload! = Workload.zalgo
 
-var Workload_longSharedPrefix: Workload! = Workload.longSharedPrefix
+let Workload_longSharedPrefix: Workload! = Workload.longSharedPrefix
 
 
 @inline(never)

benchmark/single-source/StringComparison.swift.gyb

@@ -80,7 +80,7 @@ public let StringNormalization: [BenchmarkInfo] = [
 ]
 
 % for Name in AllWorkloads:
-var Workload_${Name}: Workload! = Workload.${Name}
+let Workload_${Name}: Workload! = Workload.${Name}
 
 % end # AllWorkloads
 

benchmark/single-source/StringEdits.swift

@@ -23,7 +23,7 @@ public let StringEdits = BenchmarkInfo(
   tags: [.validation, .api, .String],
   legacyFactor: 100)
 
-var editWords: [String] = [
+let editWords: [String] = [
   "woodshed",
   "lakism",
   "gastroperiodynia",

benchmark/single-source/StringWalk.swift

@@ -91,7 +91,7 @@ let charactersMultiplier = baseMultiplier / 5
 
 // An extended benchmark suite exercising finer-granularity behavior of our
 // Strings.
-public var StringWalk = [
+public let StringWalk = [
   BenchmarkInfo(
     name: "StringWalk",
     runFunction: run_StringWalk,

benchmark/single-source/StringWalk.swift.gyb

@@ -95,7 +95,7 @@ let charactersMultiplier = baseMultiplier / 5
 
 // An extended benchmark suite exercising finer-granularity behavior of our
 // Strings.
-public var StringWalk = [
+public let StringWalk = [
   BenchmarkInfo(
     name: "StringWalk",
     runFunction: run_StringWalk,

benchmark/single-source/Walsh.swift

@@ -28,7 +28,7 @@ func IsPowerOfTwo(_ x: Int) -> Bool { return (x & (x - 1)) == 0 }
 func WalshTransform(_ data: inout [Double]) {
   assert(IsPowerOfTwo(data.count), "Not a power of two")
   var temp = [Double](repeating: 0, count: data.count)
-  var ret = WalshImpl(&data, &temp, 0, data.count)
+  let ret = WalshImpl(&data, &temp, 0, data.count)
   for i in 0..<data.count {
     data[i] = ret[i]
   }
@@ -59,11 +59,11 @@ func WalshImpl(_ data: inout [Double], _ temp: inout [Double], _ start: Int, _ s
 }
 
 func checkCorrectness() {
-  var In : [Double] = [1,0,1,0,0,1,1,0]
-  var Out : [Double] = [4,2,0,-2,0,2,0,2]
+  let In : [Double] = [1,0,1,0,0,1,1,0]
+  let Out : [Double] = [4,2,0,-2,0,2,0,2]
   var data : [Double] = In
   WalshTransform(&data)
-  var mid = data
+  let mid = data
   InverseWalshTransform(&data)
   for i in 0..<In.count {
     // Check encode.