diff --git a/include/sirit/sirit.h b/include/sirit/sirit.h
index a506fe3..3d406de 100644
--- a/include/sirit/sirit.h
+++ b/include/sirit/sirit.h
@@ -1270,6 +1270,11 @@ public:
     /// TBD
     Id OpSubgroupAllEqualKHR(Id result_type, Id predicate);
 
+    // Find the least significant bit set to 1 in Value, considering only the bits in Value required
+    // to represent all bits of the scope restricted tangle. If none of the considered bits is set to 1,
+    // the resulting value is undefined.
+    Id OpGroupNonUniformBallotFindLSB(Id result_type, Id scope, Id value);
+
     // Result is the Value of the invocation identified by the id Id to all active invocations in
     // the group.
     Id OpGroupNonUniformBroadcast(Id result_type, Id scope, Id value, Id id);
@@ -1423,8 +1428,8 @@ public:
     /// 3) store the New Value back through Pointer.
     Id OpAtomicXor(Id result_type, Id pointer, Id memory, Id semantics, Id value);
 
-    // Print a message for vulkan layers to use, e.g. renderdoc
-    // Usage is like C printf
+    /// Print a message for vulkan layers to use, e.g. renderdoc
+    /// Usage is like C printf
     Id OpDebugPrintf(Id fmt, std::span<const Id> fmt_args);
 
     /// Returns a two-component floating point vector that represents the 2D texture coordinates
@@ -1471,11 +1476,15 @@ public:
     /// Result is the middle of x, y, and z, interpreted as signed integers.
     Id OpSMid3AMD(Id result_type, Id x, Id y, Id z);
 
+    /// Returns the value of the input <interpolant> without any interpolation, i.e. the raw output value of previous shader stage.
+    Id OpInterpolateAtVertexAMD(Id result_type, Id interpolant, Id vertex_index);
+
 private:
     Id GetGLSLstd450();
     Id GetNonSemanticDebugPrintf();
     Id GetAmdGcnShader();
     Id GetAmdShaderTrinaryMinMax();
+    Id GetAmdExplicitVertexParameter();
 
     std::uint32_t version{};
     std::uint32_t bound{};
@@ -1486,6 +1495,7 @@ private:
     std::optional<Id> non_semantic_debug_printf;
     std::optional<Id> amd_gcn_shader;
     std::optional<Id> amd_shader_trinary_minmax;
+    std::optional<Id> amd_explicit_vertex_parameter;
 
     spv::AddressingModel addressing_model{spv::AddressingModel::Logical};
     spv::MemoryModel memory_model{spv::MemoryModel::GLSL450};
diff --git a/src/instructions/extension.cpp b/src/instructions/extension.cpp
index a79aa18..ea26615 100644
--- a/src/instructions/extension.cpp
+++ b/src/instructions/extension.cpp
@@ -7,6 +7,7 @@
 #include <iterator>
 #include <spirv/unified1/AMD_gcn_shader.h>
 #include <spirv/unified1/AMD_shader_trinary_minmax.h>
+#include <spirv/unified1/AMD_shader_explicit_vertex_parameter.h>
 #include <spirv/unified1/GLSL.std.450.h>
 #include <spirv/unified1/NonSemanticDebugPrintf.h>
 
@@ -110,6 +111,8 @@ DEFINE_UNARY(GetAmdGcnShader(), OpCubeFaceCoordAMD, AMD_gcn_shaderCubeFaceCoordA
 DEFINE_UNARY(GetAmdGcnShader(), OpCubeFaceIndexAMD, AMD_gcn_shaderCubeFaceIndexAMD)
 DEFINE_NULLARY(GetAmdGcnShader(), OpTimeAMD, AMD_gcn_shaderTimeAMD)
 
+DEFINE_BINARY(GetAmdExplicitVertexParameter(), OpInterpolateAtVertexAMD, AMD_shader_explicit_vertex_parameterInterpolateAtVertexAMD)
+
 DEFINE_TRINARY(GetAmdShaderTrinaryMinMax(), OpFMin3AMD, AMD_shader_trinary_minmaxFMin3AMD)
 DEFINE_TRINARY(GetAmdShaderTrinaryMinMax(), OpUMin3AMD, AMD_shader_trinary_minmaxUMin3AMD)
 DEFINE_TRINARY(GetAmdShaderTrinaryMinMax(), OpSMin3AMD, AMD_shader_trinary_minmaxSMin3AMD)
@@ -120,4 +123,5 @@ DEFINE_TRINARY(GetAmdShaderTrinaryMinMax(), OpFMid3AMD, AMD_shader_trinary_minma
 DEFINE_TRINARY(GetAmdShaderTrinaryMinMax(), OpUMid3AMD, AMD_shader_trinary_minmaxUMid3AMD)
 DEFINE_TRINARY(GetAmdShaderTrinaryMinMax(), OpSMid3AMD, AMD_shader_trinary_minmaxSMid3AMD)
 
+
 } // namespace Sirit
diff --git a/src/instructions/group.cpp b/src/instructions/group.cpp
index e7b954d..3d044cf 100644
--- a/src/instructions/group.cpp
+++ b/src/instructions/group.cpp
@@ -79,4 +79,9 @@ Id Module::OpGroupNonUniformQuadBroadcast(Id result_type, Id scope, Id value, Id
     return *code << OpId{spv::Op::OpGroupNonUniformQuadBroadcast, result_type} << scope << value << index << EndOp{};
 }
 
+Id Module::OpGroupNonUniformBallotFindLSB(Id result_type, Id scope, Id value) {
+    code->Reserve(5);
+    return *code << OpId{spv::Op::OpGroupNonUniformBallotFindLSB, result_type} << scope << value << EndOp{};
+}
+
 } // namespace Sirit
diff --git a/src/sirit.cpp b/src/sirit.cpp
index 6bbde44..59bd508 100644
--- a/src/sirit.cpp
+++ b/src/sirit.cpp
@@ -175,4 +175,15 @@ Id Module::GetAmdShaderTrinaryMinMax() {
     return *amd_shader_trinary_minmax;
 }
 
+
+Id Module::GetAmdExplicitVertexParameter() {
+    const char* extname = "SPV_AMD_shader_explicit_vertex_parameter";
+    size_t len = WordsInString(extname);
+    if (!amd_explicit_vertex_parameter) {
+        ext_inst_imports->Reserve(3 + len);
+        amd_explicit_vertex_parameter = *ext_inst_imports << OpId{spv::Op::OpExtInstImport} << extname << EndOp{};
+    }
+    return *amd_explicit_vertex_parameter;
+}
+
 } // namespace Sirit