Always use simple while loop when simd is not supported (#85267)

src/libraries/System.Private.DataContractSerialization/src/System.Private.DataContractSerialization.csproj

@@ -162,6 +162,7 @@
  <Reference Include="System.Reflection.Emit.Lightweight" />
  <Reference Include="System.Reflection.Primitives" />
  <Reference Include="System.Runtime" />
+ <Reference Include="System.Runtime.Intrinsics" />
  <Reference Include="System.Runtime.Serialization.Formatters" />
  <Reference Include="System.Runtime.Serialization.Primitives" />
  <Reference Include="System.Text.Encoding.Extensions" />

src/libraries/System.Private.DataContractSerialization/src/System/Xml/XmlStreamNodeWriter.cs

@@ -5,6 +5,7 @@
 using System.IO;
 using System.Text;
 using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
 using System.Runtime.Serialization;
 using System.Threading.Tasks;
 using System.Diagnostics;
@@ -361,7 +362,7 @@ protected unsafe int UnsafeGetUTF8Chars(char* chars, int charCount, byte[] buffe
  fixed (byte* _bytes = &buffer[offset])
  {
  // Fast path for small strings, use Encoding.GetBytes for larger strings since it is faster when vectorization is possible
- if ((uint)charCount < 32)
+ if (!Vector128.IsHardwareAccelerated || (uint)charCount < 32)
  {
  byte* bytes = _bytes;
  char* charsMax = &chars[charCount];

src/libraries/System.Runtime.Serialization.Xml/System.Runtime.Serialization.Xml.sln

@@ -1,4 +1,8 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33530.505
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestUtilities", "..\Common\tests\TestUtilities\TestUtilities.csproj", "{CBA80130-6773-4DF9-995C-DC6CBED89CB5}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Win32.Primitives", "..\Microsoft.Win32.Primitives\ref\Microsoft.Win32.Primitives.csproj", "{E5DB95E1-94AA-405C-9FFE-09B1E2498EE2}"
@@ -47,6 +51,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{DB29DBEF-FA4
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "gen", "gen", "{DE71D38E-4154-477C-9C27-3FA4ADB4098F}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Runtime.Intrinsics", "..\System.Runtime.Intrinsics\ref\System.Runtime.Intrinsics.csproj", "{755CD0A1-7280-48C1-BE5B-ABE897F6657D}"
+EndProject
 Global
  GlobalSection(SolutionConfigurationPlatforms) = preSolution
  Debug|Any CPU = Debug|Any CPU
@@ -133,31 +139,36 @@ Global
  {DF2255F4-F671-4C15-9100-D8079992E19D}.Debug|Any CPU.Build.0 = Debug|Any CPU
  {DF2255F4-F671-4C15-9100-D8079992E19D}.Release|Any CPU.ActiveCfg = Release|Any CPU
  {DF2255F4-F671-4C15-9100-D8079992E19D}.Release|Any CPU.Build.0 = Release|Any CPU
+ {755CD0A1-7280-48C1-BE5B-ABE897F6657D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {755CD0A1-7280-48C1-BE5B-ABE897F6657D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {755CD0A1-7280-48C1-BE5B-ABE897F6657D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {755CD0A1-7280-48C1-BE5B-ABE897F6657D}.Release|Any CPU.Build.0 = Release|Any CPU
  EndGlobalSection
  GlobalSection(SolutionProperties) = preSolution
  HideSolutionNode = FALSE
  EndGlobalSection
  GlobalSection(NestedProjects) = preSolution
  {CBA80130-6773-4DF9-995C-DC6CBED89CB5} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
- {8B069551-9B95-464E-BB40-C56817506FEC} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
- {8FF5E841-29F6-4DB7-A4F8-9281FBDA0B9C} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
- {45263D7D-249E-4810-8F7D-1DEF25515210} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
  {E5DB95E1-94AA-405C-9FFE-09B1E2498EE2} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  {7DF41C40-FE5D-41DF-B106-3DD77BE4D4B5} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
+ {1392041A-E2CA-4553-BEAF-363974651B81} = {DB29DBEF-FA4E-4334-AFB8-BFB2DA82D1DE}
  {E3347E75-EAE8-4E6B-98D1-7230B1EE5450} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  {5EE18CED-28AE-4415-B5A3-C31123BF57E1} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  {E813073E-07A7-4C88-A505-484CB33C9DC4} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
+ {76AC3DDD-2B38-489F-A8B0-8E43054595DB} = {DB29DBEF-FA4E-4334-AFB8-BFB2DA82D1DE}
+ {7D7457FD-B88C-4375-926D-7D46C71E34A7} = {DE71D38E-4154-477C-9C27-3FA4ADB4098F}
+ {D5FF2DBA-F304-4ACB-8F82-B8F9321E22A9} = {DE71D38E-4154-477C-9C27-3FA4ADB4098F}
  {DAD8EBB8-A1D6-4E8F-A334-D7F0273280D1} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  {0C045A64-AE30-47CC-A931-5B5C6C9EF06D} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  {19F785D2-F7A4-41AB-9301-A6AD7E40B238} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
- {9759BE1C-98A0-4319-AC82-D432002BD66B} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
- {DF2255F4-F671-4C15-9100-D8079992E19D} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
- {1392041A-E2CA-4553-BEAF-363974651B81} = {DB29DBEF-FA4E-4334-AFB8-BFB2DA82D1DE}
- {76AC3DDD-2B38-489F-A8B0-8E43054595DB} = {DB29DBEF-FA4E-4334-AFB8-BFB2DA82D1DE}
  {6FD10BE0-24C8-456E-8B9A-FD101C05C961} = {DB29DBEF-FA4E-4334-AFB8-BFB2DA82D1DE}
- {7D7457FD-B88C-4375-926D-7D46C71E34A7} = {DE71D38E-4154-477C-9C27-3FA4ADB4098F}
- {D5FF2DBA-F304-4ACB-8F82-B8F9321E22A9} = {DE71D38E-4154-477C-9C27-3FA4ADB4098F}
+ {8B069551-9B95-464E-BB40-C56817506FEC} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
+ {8FF5E841-29F6-4DB7-A4F8-9281FBDA0B9C} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
+ {45263D7D-249E-4810-8F7D-1DEF25515210} = {41101B02-36C9-476B-98D5-1A6E105BBF4A}
+ {9759BE1C-98A0-4319-AC82-D432002BD66B} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  {6E942A4A-405E-4AAD-89A7-006358A8A004} = {DE71D38E-4154-477C-9C27-3FA4ADB4098F}
+ {DF2255F4-F671-4C15-9100-D8079992E19D} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
+ {755CD0A1-7280-48C1-BE5B-ABE897F6657D} = {18E62E91-73A2-48AE-BEFF-CE7C64DF759D}
  EndGlobalSection
  GlobalSection(ExtensibilityGlobals) = postSolution
  SolutionGuid = {EE9FB522-4B73-4E3E-B63D-C21826BB7B5D}