diff --git a/docs/ReleaseNotes.md b/docs/ReleaseNotes.md
index a84fefc05af..d5cdd69843e 100644
--- a/docs/ReleaseNotes.md
+++ b/docs/ReleaseNotes.md
@@ -89,6 +89,8 @@ line upon naming the release. Refer to previous for appropriate section names.
 
 #### Bug Fixes
 
+- Fixed a DXBC-to-DXIL conversion crash when hull shaders index control points
+  directly with `SV_OutputControlPointID`.
 - Improved compiler performance by reducing excessive memory-dependence scans
   during GVN and repeated vector-elimination work.
 - Fixed GVN load forwarding generating unsupported integer types when optimizing
diff --git a/projects/dxilconv/lib/DxbcConverter/DxbcConverter.cpp b/projects/dxilconv/lib/DxbcConverter/DxbcConverter.cpp
index b668feb4d98..35e176f34f9 100644
--- a/projects/dxilconv/lib/DxbcConverter/DxbcConverter.cpp
+++ b/projects/dxilconv/lib/DxbcConverter/DxbcConverter.cpp
@@ -7632,6 +7632,14 @@ Value *DxbcConverter::LoadOperandIndexRelative(
   Value *pValue = nullptr;
 
   switch (OpIndex.m_RelRegType) {
+  case D3D11_SB_OPERAND_TYPE_OUTPUT_CONTROL_POINT_ID: {
+    OP::OpCode OpCode = OP::OpCode::OutputControlPointID;
+    Function *F = m_pOP->GetOpFunc(OpCode, Type::getInt32Ty(m_Ctx));
+    Value *Args[] = {m_pOP->GetU32Const((unsigned)OpCode)};
+    pValue = m_pBuilder->CreateCall(F, Args);
+    break;
+  }
+
   case D3D10_SB_OPERAND_TYPE_TEMP: {
     unsigned Reg = OpIndex.m_RelIndex;
     unsigned Comp = OpIndex.m_ComponentName;
@@ -7667,7 +7675,7 @@ Value *DxbcConverter::LoadOperandIndexRelative(
   }
 
   default:
-    DXASSERT_DXBC(false);
+    IFT(DXC_E_INCORRECT_DXBC);
   }
 
   return pValue;
diff --git a/projects/dxilconv/test/dxbc2dxil-asm/hull-layer-viewport.asm b/projects/dxilconv/test/dxbc2dxil-asm/hull-layer-viewport.asm
new file mode 100644
index 00000000000..4bfa58104d5
--- /dev/null
+++ b/projects/dxilconv/test/dxbc2dxil-asm/hull-layer-viewport.asm
@@ -0,0 +1,63 @@
+/*// RUN: %testasm %s /Fo %t.dxbc*/
+// RUN: %dxbc2dxil %t.dxbc /emit-llvm | %FileCheck %s
+
+// Reproduces the hull shader conversion crash reported in
+// https://github.com/HansKristian-Work/vkd3d-proton/pull/3462.
+// The accompanying DXBC is extracted from hs_layer_viewport_code_dxbc at
+// commit 50c07246e6cf2d7d00e68a2a0adcb986e8d57f21; this is its disassembly.
+// FXC cannot assemble Shader Model 5 text. Recompiling the original HLSL with
+// FXC removes the identity control-point phase or indexes through a temporary,
+// so it does not preserve the direct vOutputControlPointID indexing below.
+// Direct control-point ID indexing must lower to dx.op.outputControlPointID
+// rather than leaving null vertex-index operands in the generated load calls.
+
+// Input and output signatures:
+// SV_Position               0  xyzw  register 0  float
+// SV_RenderTargetArrayIndex 0  x     register 1  uint
+// SV_ViewportArrayIndex     0  y     register 1  uint
+// Patch constant signature:
+// SV_TessFactor             0  x     register 0  float (TRIEDGE)
+// SV_TessFactor             1  x     register 1  float (TRIEDGE)
+// SV_TessFactor             2  x     register 2  float (TRIEDGE)
+// SV_InsideTessFactor       0  x     register 3  float (TRIINT)
+
+// CHECK-LABEL: define void @main()
+// CHECK: %[[ID:[0-9]+]] = call i32 @dx.op.outputControlPointID.i32(i32 107)
+// CHECK-DAG: call float @dx.op.loadInput.f32(i32 4, i32 0, i32 0, i8 0, i32 %[[ID]])
+// CHECK-DAG: call float @dx.op.loadInput.f32(i32 4, i32 0, i32 0, i8 1, i32 %[[ID]])
+// CHECK-DAG: call float @dx.op.loadInput.f32(i32 4, i32 0, i32 0, i8 2, i32 %[[ID]])
+// CHECK-DAG: call float @dx.op.loadInput.f32(i32 4, i32 0, i32 0, i8 3, i32 %[[ID]])
+// CHECK: %[[LAYERID:[0-9]+]] = call i32 @dx.op.outputControlPointID.i32(i32 107)
+// CHECK: call i32 @dx.op.loadInput.i32(i32 4, i32 1, i32 0, i8 0, i32 %[[LAYERID]])
+// CHECK: %[[VIEWPORTID:[0-9]+]] = call i32 @dx.op.outputControlPointID.i32(i32 107)
+// CHECK: call i32 @dx.op.loadInput.i32(i32 4, i32 2, i32 0, i8 0, i32 %[[VIEWPORTID]])
+
+hs_5_0
+hs_decls
+dcl_input_control_point_count 3
+dcl_output_control_point_count 3
+dcl_tessellator_domain domain_tri
+dcl_tessellator_partitioning partitioning_integer
+dcl_tessellator_output_primitive output_triangle_ccw
+hs_control_point_phase
+dcl_output o0.xyzw
+dcl_output o1.x
+dcl_output o1.y
+dcl_input v[3][0].xyzw
+dcl_input v[3][1].x
+dcl_input v[3][1].y
+dcl_input vOutputControlPointID
+mov o0.xyzw, v[vOutputControlPointID0.x + 0][0].xyzw
+mov o1.x, v[vOutputControlPointID0.x + 0][1].xxxx
+mov o1.y, v[vOutputControlPointID0.x + 0][1].yyyy
+ret
+hs_fork_phase
+dcl_output_siv o0.x, finalTriUeq0EdgeTessFactor
+dcl_output_siv o1.x, finalTriVeq0EdgeTessFactor
+dcl_output_siv o2.x, finalTriWeq0EdgeTessFactor
+dcl_output_siv o3.x, finalTriInsideTessFactor
+mov o0.x, l(1.000000)
+mov o1.x, l(1.000000)
+mov o2.x, l(1.000000)
+mov o3.x, l(1.000000)
+ret
diff --git a/projects/dxilconv/test/dxbc2dxil-asm/hull-layer-viewport.dxbc b/projects/dxilconv/test/dxbc2dxil-asm/hull-layer-viewport.dxbc
new file mode 100644
index 00000000000..cd73bcd96d0
Binary files /dev/null and b/projects/dxilconv/test/dxbc2dxil-asm/hull-layer-viewport.dxbc differ