Fix for operator assignment issue (#2951)

* WIP handling LValue coercion via LValueImplicitCast

* Need to have the ptr type for the cast.

* Casting conversion working on C++.

* Make the LValue casts record if in or in/out as we can produce better code if we know the difference.

* WIP LValueCast pass

* Fix tests so we don't fail because downstream compilers detect use of uninitialized variable.

* Do conversions through through tmp for l-value scenarios that can't work other ways.

* Fix a typo.

* Change diagnostic implicit-cast-lvalue for a type that still exhibits the issue.

* Add matrix test.

* Added a bit more clarity around LValue casting choices.

* Small comment improvements.
Improvements based on comments on PR.

* Use findOuterGeneric.

1 files changed, 14 insertions, 0 deletions

diff --git a/source/slang/slang-emit-cpp.cpp b/source/slang/slang-emit-cpp.cpp
index 49edec92b..ef9b7f54e 100644
--- a/source/slang/slang-emit-cpp.cpp
+++ b/source/slang/slang-emit-cpp.cpp
@@ -1200,6 +1200,20 @@ bool CPPSourceEmitter::tryEmitInstExprImpl(IRInst* inst, const EmitOpInfo& inOut
         {
             return false;
         }
+       
+        case kIROp_InOutImplicitCast:
+        case kIROp_OutImplicitCast:
+        {
+            // We'll just the LValue to be the desired type
+            m_writer->emit("reinterpret_cast<");
+            emitType(inst->getDataType());
+            m_writer->emit(">(");
+            
+            emitOperand(inst->getOperand(0), getInfo(EmitOp::General));
+
+            m_writer->emit(")");
+            return true;
+        }
         case kIROp_MakeVector:
         {
             IRType* retType = inst->getFullType();