SKIP: FAILED uint tint_dot4U8Packed(uint param_0, uint param_1) { uint accumulator = 0u; return dot4add_u8packed(param_0, param_1, accumulator); } RWByteAddressBuffer prevent_dce : register(u0, space2); void dot4U8Packed_fbed7b() { uint arg_0 = 1u; uint arg_1 = 1u; uint res = tint_dot4U8Packed(arg_0, arg_1); prevent_dce.Store(0u, asuint(res)); } struct tint_symbol { float4 value : SV_Position; }; float4 vertex_main_inner() { dot4U8Packed_fbed7b(); return (0.0f).xxxx; } tint_symbol vertex_main() { const float4 inner_result = vertex_main_inner(); tint_symbol wrapper_result = (tint_symbol)0; wrapper_result.value = inner_result; return wrapper_result; } void fragment_main() { dot4U8Packed_fbed7b(); return; } [numthreads(1, 1, 1)] void compute_main() { dot4U8Packed_fbed7b(); return; } DXC validation failure: warning: DXIL.dll not found. Resulting DXIL will not be signed for use in release environments. error: validation errors shader.hlsl:3:10: error: Opcode Dot4AddU8Packed not valid in shader model vs_6_0. note: at '%2 = call i32 @dx.op.dot4AddPacked.i32(i32 164, i32 0, i32 1, i32 1)' in block '#0' of function 'vertex_main'. Validation failed. warning: DXIL.dll not found. Resulting DXIL will not be signed for use in release environments. error: validation errors shader.hlsl:3:10: error: Opcode Dot4AddU8Packed not valid in shader model ps_6_0. note: at '%2 = call i32 @dx.op.dot4AddPacked.i32(i32 164, i32 0, i32 1, i32 1)' in block '#0' of function 'fragment_main'. Validation failed. warning: DXIL.dll not found. Resulting DXIL will not be signed for use in release environments. error: validation errors shader.hlsl:3:10: error: Opcode Dot4AddU8Packed not valid in shader model cs_6_0. note: at '%2 = call i32 @dx.op.dot4AddPacked.i32(i32 164, i32 0, i32 1, i32 1)' in block '#0' of function 'compute_main'. Validation failed.