From 444ff4d8fdeb721b94a9424d03c162f43fb217c9 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 6 Nov 2020 10:26:27 -0800
Subject: Specialize witness table lookups. (#1596)

* Specialize witness table lookups.

* Remove generated files from vcxproj

* Fix call to generic interface methods.
---
 source/slang/slang-ir-generics-lowering-context.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'source/slang/slang-ir-generics-lowering-context.cpp')

diff --git a/source/slang/slang-ir-generics-lowering-context.cpp b/source/slang/slang-ir-generics-lowering-context.cpp
index 9c4eb7856..bef4dbb0a 100644
--- a/source/slang/slang-ir-generics-lowering-context.cpp
+++ b/source/slang/slang-ir-generics-lowering-context.cpp
@@ -219,6 +219,21 @@ namespace Slang
         }
     }
 
+    List<IRWitnessTable*> SharedGenericsLoweringContext::getWitnessTablesFromInterfaceType(IRInst* interfaceType)
+    {
+        List<IRWitnessTable*> witnessTables;
+        for (auto globalInst : module->getGlobalInsts())
+        {
+            if (globalInst->op == kIROp_WitnessTable &&
+                cast<IRWitnessTableType>(globalInst->getDataType())->getConformanceType() ==
+                    interfaceType)
+            {
+                witnessTables.add(cast<IRWitnessTable>(globalInst));
+            }
+        }
+        return witnessTables;
+    }
+
     IRIntegerValue SharedGenericsLoweringContext::getInterfaceAnyValueSize(IRInst* type, SourceLoc usageLocation)
     {
         if (auto decor = type->findDecoration<IRAnyValueSizeDecoration>())
-- 
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