Various fixes to CUDA backend. (#1877)

- Fix emitting `StructuredBuffer<ISomething>::Load`, which triggers emitting for `IROp_WrapExistential` that is previously unhandled.

- Fix cuda layout around vectors, they should be aligned to 1,2,4,8,16 bytes instead of just using element type's alignment. That means `float4` has alignment of 16 instead of 4.

- Fix `SLANG_CUDA_HANDLE_ERROR` macro definition.

- Fix navis sometimes fail to find `Slang::kIROp_*` enum values when debugging external projects.

Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>

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 1b0fe7c44..47c584251 100644
--- a/source/slang/slang-emit-c-like.cpp
+++ b/source/slang/slang-emit-c-like.cpp
@@ -1794,6 +1794,17 @@ void CLikeSourceEmitter::defaultEmitInstExpr(IRInst* inst, const EmitOpInfo& inO
         }
         break;
 
+    case kIROp_WrapExistential:
+        {
+            // Normally `WrapExistential` shouldn't exist in user code at this point.
+            // The only exception is when the user is calling a stdlib generic
+            // function that has an existential type argument, for example
+            // `StructuredBuffer<ISomething>.Load()`.
+            // We can safely ignore the `wrapExistential` operation in this case.
+            emitOperand(inst->getOperand(0), outerPrec);
+        }
+        break;
+
     case kIROp_Select:
         {