PPTC & Pool Enhancements. (#1968)

* PPTC & Pool Enhancements.

* Avoid buffer allocations in CodeGenContext.GetCode(). Avoid stream allocations in PTC.PtcInfo.

Refactoring/nits.

* Use XXHash128, for Ptc.Load & Ptc.Save, x10 faster than Md5.

* Why not a nice Span.

* Added a simple PtcFormatter library for deserialization/serialization, which does not require reflection, in use at PtcJumpTable and PtcProfiler; improves maintainability and simplicity/readability of affected code.

* Nits.

* Revert #1987.

* Revert "Revert #1987."

This reverts commit 998be765cf7f7da5ff0c1c08de704c9012b0f49c.

1 files changed, 4 insertions, 11 deletions

diff --git a/ARMeilleure/CodeGen/X86/CodeGenContext.cs b/ARMeilleure/CodeGen/X86/CodeGenContext.cs
index da147cca..fa726f2f 100644
--- a/ARMeilleure/CodeGen/X86/CodeGenContext.cs
+++ b/ARMeilleure/CodeGen/X86/CodeGenContext.cs
@@ -2,6 +2,7 @@ using ARMeilleure.CodeGen.RegisterAllocators;
 using ARMeilleure.Common;
 using ARMeilleure.IntermediateRepresentation;
 using ARMeilleure.Translation.PTC;
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
@@ -301,15 +302,13 @@ namespace ARMeilleure.CodeGen.X86
             {
                 Assembler assembler = new Assembler(codeStream, _ptcInfo);
 
-                byte[] buffer;
-
                 for (int index = 0; index < _jumps.Count; index++)
                 {
                     Jump jump = _jumps[index];
 
-                    buffer = new byte[jump.JumpPosition - _stream.Position];
+                    Span<byte> buffer = new byte[jump.JumpPosition - _stream.Position];
 
-                    _stream.Read(buffer, 0, buffer.Length);
+                    _stream.Read(buffer);
                     _stream.Seek(_ptcDisabled ? ReservedBytesForJump : jump.InstSize, SeekOrigin.Current);
 
                     codeStream.Write(buffer);
@@ -324,13 +323,7 @@ namespace ARMeilleure.CodeGen.X86
                     }
                 }
 
-                buffer = new byte[_stream.Length - _stream.Position];
-
-                _stream.Read(buffer, 0, buffer.Length);
-
-                codeStream.Write(buffer);
-
-                _ptcInfo?.WriteCode(codeStream);
+                _stream.CopyTo(codeStream);
 
                 return codeStream.ToArray();
             }