From c571bcb025009f9c662e8d631fa49dbfed560287 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 28 Apr 2023 23:28:23 -0700
Subject: SSA Register Allocation improvements. (#2857)

* SSA Register Allocation improvements.

* Fix.

* Rename `Use`->`UseOrPseudoUse`.

---------

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang/slang-ir-util.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

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

diff --git a/source/slang/slang-ir-util.cpp b/source/slang/slang-ir-util.cpp
index a69e13562..95240a26c 100644
--- a/source/slang/slang-ir-util.cpp
+++ b/source/slang/slang-ir-util.cpp
@@ -759,6 +759,21 @@ void removePhiArgs(IRInst* phiParam)
     }
 }
 
+int getParamIndexInBlock(IRParam* paramInst)
+{
+    auto block = as<IRBlock>(paramInst->getParent());
+    if (!block)
+        return -1;
+    int paramIndex = 0;
+    for (auto param : block->getParams())
+    {
+        if (param == paramInst)
+            return paramIndex;
+        paramIndex++;
+    }
+    return -1;
+}
+
 struct GenericChildrenMigrationContextImpl
 {
     IRCloneEnv cloneEnv;
-- 
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