Merge pull request shader-slang#1383 from csyonghe/dyndispatch

Add compiler flag to disable specialization pass.

Author: csyonghe

.gitignore

@@ -31,3 +31,9 @@ tests/**/*.cpp
 # Files generated by other shader compilers
 
 *.spv
+
+# Intermediate source files generated during build process
+/source/slang/slang-ast-generated.h
+/source/slang/slang-ast-generated-macro.h
+/source/slang/hlsl.meta.slang.h
+/source/slang/core.meta.slang.h

source/slang/slang-compiler.h

@@ -1759,6 +1759,10 @@ namespace Slang
             /// Should SPIR-V be generated directly from Slang IR rather than via translation to GLSL?
         bool shouldEmitSPIRVDirectly = false;
 
+
+        // If true will allow generating dynamic dispatch code for generics.
+        bool allowDynamicCode = false;
+
         String m_dumpIntermediatePrefix;
 
     private:

source/slang/slang-emit.cpp

@@ -270,7 +270,8 @@ Result linkAndOptimizeIR(
     // perform specialization of functions based on parameter
     // values that need to be compile-time constants.
     //
-    specializeModule(irModule);
+    if (!compileRequest->allowDynamicCode)
+        specializeModule(irModule);
 
     // Debugging code for IR transformations...
 #if 0

source/slang/slang-options.cpp

@@ -557,6 +557,10 @@ struct OptionsParser
                 {
                     requestImpl->getFrontEndReq()->useSerialIRBottleneck = true;
                 }
+                else if (argStr == "-allow-dynamic-code")
+                {
+                    requestImpl->getBackEndReq()->allowDynamicCode = true;
+                }
                 else if (argStr == "-verbose-paths")
                 {
                     requestImpl->getSink()->setFlag(DiagnosticSink::Flag::VerbosePath);