Feature/source loc refactor (#668)

* * Remove the need for IRHighLevelDecoration in Emit
* Use the IRLayoutDecoration for GeometryShaderPrimitiveTypeModifier

* Initial look at at variable byte encoding, and simple unit test.

* Fixing problems with comparison due to naming differences with slang/fxc.

* * More tests and perf improvements for byte encoding.
* Mechanism to detect processor and processor features in main slang header.

* Split out cpu based defines into slang-cpu-defines.h so do not polute slang.h

* Support for variable byte encoding on serialization.

* Removed unused flag.

* Fix warning.

* Fix calcMsByte32 for 0 values without using intrinsic.

* Fix a mistake in calculating maximum instruction size.

* Introduced the idea of SourceUnit.

* Small improvements around naming.
Add more functionality - including getting the HumaneLoc.

* Add support for #line default

* Compiling with new SourceLoc handling.

* Fix off by one on #line directives.

* Can use 32bits for SourceLoc. Fix serialize to use that.

* Small fixes and comment on usage.

* Premake run.

* Fix signed warning.

* Fix typo on StringSlicePool::has found in review.

1 files changed, 5 insertions, 16 deletions

diff --git a/source/slang/ir-serialize.cpp b/source/slang/ir-serialize.cpp
index c02ef7ee5..d82641168 100644
--- a/source/slang/ir-serialize.cpp
+++ b/source/slang/ir-serialize.cpp
@@ -976,11 +976,8 @@ static size_t _calcInstChunkSize(IRSerialBinary::CompressionType compressionType
     SLANG_RETURN_ON_FAIL(_writeArrayChunk(compressionType, Bin::kExternalOperandsFourCc, data.m_externalOperands, stream));
     SLANG_RETURN_ON_FAIL(_writeArrayChunk(Bin::CompressionType::None, Bin::kStringFourCc, data.m_strings, stream));
 
-    {
-        uint32_t fourCc = sizeof(IRSerialData::RawSourceLoc) == 4 ? Bin::kUInt32SourceLocFourCc : Bin::kUInt64SourceLocFourCc;
-        SLANG_RETURN_ON_FAIL(_writeArrayChunk(Bin::CompressionType::None, fourCc, data.m_rawSourceLocs, stream));
-    }
-
+    SLANG_RETURN_ON_FAIL(_writeArrayChunk(Bin::CompressionType::None, Bin::kUInt32SourceLocFourCc, data.m_rawSourceLocs, stream));
+    
     return SLANG_OK;
 }
 
@@ -1337,18 +1334,10 @@ int64_t _calcChunkTotalSize(const IRSerialBinary::Chunk& chunk)
                 break;
             }
             case Bin::kUInt32SourceLocFourCc:
-            case Bin::kUInt64SourceLocFourCc:
             {
-                if ((sizeof(IRSerialData::RawSourceLoc) == 4 && chunk.m_type == Bin::kUInt32SourceLocFourCc) ||
-                    (sizeof(IRSerialData::RawSourceLoc) == 8 && chunk.m_type == Bin::kUInt64SourceLocFourCc))
-                {
-                    SLANG_RETURN_ON_FAIL(_readArrayUncompressedChunk(slangHeader, chunk, stream, &bytesRead, dataOut->m_rawSourceLocs));
-                    remainingBytes -= _calcChunkTotalSize(chunk);
-                }
-                else
-                {
-                    SLANG_RETURN_ON_FAIL(_skip(chunk, stream, &remainingBytes));
-                }
+                
+                SLANG_RETURN_ON_FAIL(_readArrayUncompressedChunk(slangHeader, chunk, stream, &bytesRead, dataOut->m_rawSourceLocs));
+                remainingBytes -= _calcChunkTotalSize(chunk);
                 break;
             }
             default: