Fix enum array indexing by adding implicit conversion support (#7815)

* Initial plan

* Fix enum array indexing by adding implicit conversion support

Co-authored-by: csyonghe <2652293+csyonghe@users.noreply.github.com>

* Update enum array indexing test to support GPU backends

Co-authored-by: csyonghe <2652293+csyonghe@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: csyonghe <2652293+csyonghe@users.noreply.github.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/source/slang/slang-check-decl.cpp b/source/slang/slang-check-decl.cpp
index 1dc230dae..806912abe 100644
--- a/source/slang/slang-check-decl.cpp
+++ b/source/slang/slang-check-decl.cpp
@@ -8485,6 +8485,16 @@ bool SemanticsVisitor::isScalarIntegerType(Type* type)
     return isIntegerBaseType(baseType) || baseType == BaseType::Bool;
 }
 
+Type* SemanticsVisitor::getMatchingIntType(Type* type)
+{
+    if (isScalarIntegerType(type))
+        return type;
+    if (auto enumTypeDecl = isDeclRefTypeOf<EnumDecl>(type))
+        if (enumTypeDecl.getDecl()->tagType)
+            return getMatchingIntType(enumTypeDecl.getDecl()->tagType);
+    return m_astBuilder->getIntType();
+}
+
 bool SemanticsVisitor::isHalfType(Type* type)
 {
     auto basicType = as<BasicExpressionType>(type);