From 1cfb1c85b52e00cde2d21874a88cda2c22d18b62 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 19 Jul 2023 13:50:49 -0700
Subject: Optimize specialization, and remove unnecessary calls to
 `simplifyIR`. (#2999)

* Remove unneccessary calls to `simplifyIR`.

* fix.

* Delete obsolete hoistConst pass.

* Fix.

* Small improvements.

* Fix.

* Fix enum lowering.

* fix

* tweaks.

* tweaks.

---------

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-lower-to-ir.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'source/slang/slang-lower-to-ir.cpp')

diff --git a/source/slang/slang-lower-to-ir.cpp b/source/slang/slang-lower-to-ir.cpp
index 0dcea9a14..63dc39a20 100644
--- a/source/slang/slang-lower-to-ir.cpp
+++ b/source/slang/slang-lower-to-ir.cpp
@@ -3674,7 +3674,11 @@ struct ExprLoweringVisitorBase : ExprVisitor<Derived, LoweredValInfo>
         else if (auto declRefType = as<DeclRefType>(type))
         {
             DeclRef<Decl> declRef = declRefType->declRef;
-            if (auto aggTypeDeclRef = declRef.as<AggTypeDecl>())
+            if (auto enumType = declRef.as<EnumDecl>())
+            {
+                return LoweredValInfo::simple(getBuilder()->getIntValue(irType, 0));
+            }
+            else if (auto aggTypeDeclRef = declRef.as<AggTypeDecl>())
             {
                 List<IRInst*> args;
 
@@ -9854,7 +9858,11 @@ RefPtr<IRModule> generateIRForTranslationUnit(
     constructSSA(module);
     simplifyCFG(module);
     applySparseConditionalConstantPropagation(module, compileRequest->getSink());
-
+    for (auto inst : module->getGlobalInsts())
+    {
+        if (auto func = as<IRGlobalValueWithCode>(inst))
+            eliminateDeadCode(func);
+    }
     // Next, inline calls to any functions that have been
     // marked for mandatory "early" inlining.
     //
-- 
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