Add Loop Unrolling Pass. (#2644)

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/source/slang/slang-ir-util.cpp b/source/slang/slang-ir-util.cpp
index 942c8f2f8..0448eb649 100644
--- a/source/slang/slang-ir-util.cpp
+++ b/source/slang/slang-ir-util.cpp
@@ -443,6 +443,27 @@ bool canInstHaveSideEffectAtAddress(IRGlobalValueWithCode* func, IRInst* inst, I
     return false;
 }
 
+IRInst* getUndefInst(IRBuilder builder, IRModule* module)
+{
+    IRInst* undefInst = nullptr;
+
+    for (auto inst : module->getModuleInst()->getChildren())
+    {
+        if (inst->getOp() == kIROp_undefined && inst->getDataType() && inst->getDataType()->getOp() == kIROp_VoidType)
+        {
+            undefInst = inst;
+            break;
+        }
+    }
+    if (!undefInst)
+    {
+        auto voidType = builder.getVoidType();
+        builder.setInsertAfter(voidType);
+        undefInst = builder.emitUndefined(voidType);
+    }
+    return undefInst;
+}
+
 bool isPureFunctionalCall(IRCall* call)
 {
     auto callee = getResolvedInstForDecorations(call->getCallee());