Add support for [noinline] attribute (#1650)

This adds the `[noinline]` attribute to the front-end, and passes it through when generating HLSL output.

Notes:

* This change doesn't include a test since the dxc version I have locally parses `[noinline]` but then generates DXIL that fails validation.

* This change doesn't include logic to handle `[noinline]` for other targets. Notably, SPIR-V has decorations that convey the same intention, but we don't yet take advantage of the GLSL extension(s) that would let us generate those decorations.

* By necesstiy, `[noinline]` is only a "strong suggestion" and not actually something the compiler can ever guarantee/enforce.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/slang/slang-lower-to-ir.cpp b/source/slang/slang-lower-to-ir.cpp
index 34b189b14..1ea3c71fb 100644
--- a/source/slang/slang-lower-to-ir.cpp
+++ b/source/slang/slang-lower-to-ir.cpp
@@ -7041,6 +7041,11 @@ struct DeclLoweringVisitor : DeclVisitor<DeclLoweringVisitor, LoweredValInfo>
             getBuilder()->addSimpleDecoration<IRRequiresNVAPIDecoration>(irFunc);
         }
 
+        if(decl->findModifier<NoInlineAttribute>())
+        {
+            getBuilder()->addSimpleDecoration<IRNoInlineDecoration>(irFunc);
+        }
+
         if (decl->findModifier<PublicModifier>()) {
             getBuilder()->addSimpleDecoration<IRPublicDecoration>(irFunc);
         }