Fix cuda/cpp/metal crash for when using GLSL style shader inputs (#4378)

Decorations were not expected as an input, this causes a crash.

1 files changed, 5 insertions, 1 deletions

diff --git a/source/slang/slang-ir-explicit-global-context.cpp b/source/slang/slang-ir-explicit-global-context.cpp
index 9bbaf3875..9d3f09712 100644
--- a/source/slang/slang-ir-explicit-global-context.cpp
+++ b/source/slang/slang-ir-explicit-global-context.cpp
@@ -462,11 +462,15 @@ struct IntroduceExplicitGlobalContextPass
         for( IRUse* use = globalVar->firstUse; use; use = nextUse )
         {
             nextUse = use->nextUse;
+            auto user = use->getUser();
+
+            // Ensure the use site checked actually requires a replacement
+            if (as<IRDecoration>(user))
+                continue;
 
             // At each use site, we need to look up the context
             // pointer that is appropriate for that use.
             //
-            auto user = use->getUser();
             auto contextParam = findOrCreateContextPtrForInst(user);
             builder.setInsertBefore(user);