diff --git a/src/dxbc/dxbc_chunk_isgn.cpp b/src/dxbc/dxbc_chunk_isgn.cpp
index 45285014f..bd67f4ca8 100644
--- a/src/dxbc/dxbc_chunk_isgn.cpp
+++ b/src/dxbc/dxbc_chunk_isgn.cpp
@@ -76,6 +76,14 @@ namespace dxvk {
   }
 
 
+  uint32_t DxbcIsgn::maxRegisterCount() const {
+    uint32_t result = 0;
+    for (auto e = this->begin(); e != this->end(); e++)
+      result = std::max(result, e->registerId + 1);
+    return result;
+  }
+
+
   bool DxbcIsgn::compareSemanticNames(
     const std::string& a, const std::string& b) const {
     if (a.size() != b.size())
diff --git a/src/dxbc/dxbc_chunk_isgn.h b/src/dxbc/dxbc_chunk_isgn.h
index 44c4f6669..baf4aa5ec 100644
--- a/src/dxbc/dxbc_chunk_isgn.h
+++ b/src/dxbc/dxbc_chunk_isgn.h
@@ -52,6 +52,8 @@ namespace dxvk {
     DxbcRegMask regMask(
             uint32_t     registerId) const;
     
+    uint32_t maxRegisterCount() const;
+    
   private:
     
     std::vector<DxbcSgnEntry> m_entries;