Apply IR simplifcation immediately after specialization to avoid duplicates. (#2739)

* Apply IR simplifcation immediately after specialization to avoid duplicates.

* Update source/slang/slang-ir-specialize.cpp

Co-authored-by: Ellie Hermaszewska <github@sub.monoid.al>

---------

Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: Ellie Hermaszewska <github@sub.monoid.al>

1 files changed, 10 insertions, 0 deletions

diff --git a/source/slang/slang-ir-specialize.cpp b/source/slang/slang-ir-specialize.cpp
index 05c28d131..d2e042363 100644
--- a/source/slang/slang-ir-specialize.cpp
+++ b/source/slang/slang-ir-specialize.cpp
@@ -2439,6 +2439,16 @@ IRInst* specializeGenericImpl(
                 // value.
                 cloneInstDecorationsAndChildren(
                     &env, module, specializeInst, specializedVal);
+
+                // Perform IR simplifications to fold constants in this specialized value if it is a function, so 
+                // further specializations from the specialized function will have as simple specialization 
+                // arguments as possible to avoid creating specializations that eventually simplified into 
+                // the same thing.
+                if (auto func = as<IRFunc>(specializedVal))
+                {
+                    simplifyFunc(func);
+                }
+
                 return specializedVal;
             }