Implement bitcast for 64-bit date type (#5895)

Close #5470

* implement bitcast for 64-bit date type
* Move 'ensurePrelude' to base class to remove duplication
* Assert on 'double' type for Metal target, as Metal doesn't have 'double' support

1 files changed, 11 insertions, 0 deletions

diff --git a/source/slang/slang-emit-c-like.cpp b/source/slang/slang-emit-c-like.cpp
index f38adc67e..b70069d42 100644
--- a/source/slang/slang-emit-c-like.cpp
+++ b/source/slang/slang-emit-c-like.cpp
@@ -5137,4 +5137,15 @@ void CLikeSourceEmitter::emitModuleImpl(IRModule* module, DiagnosticSink* sink)
     executeEmitActions(actions);
 }
 
+void CLikeSourceEmitter::ensurePrelude(const char* preludeText)
+{
+    IRStringLit* stringLit;
+    if (!m_builtinPreludes.tryGetValue(preludeText, stringLit))
+    {
+        IRBuilder builder(m_irModule);
+        stringLit = builder.getStringValue(UnownedStringSlice(preludeText));
+        m_builtinPreludes[preludeText] = stringLit;
+    }
+    m_requiredPreludes.add(stringLit);
+}
 } // namespace Slang