SPIRV-Cross/reference/opt/shaders/amd/gcn_shader.comp

#version 450
#if defined(GL_ARB_gpu_shader_int64)
#extension GL_ARB_gpu_shader_int64 : require
#elif defined(GL_NV_gpu_shader5)
#extension GL_NV_gpu_shader5 : require
#else
#error No extension available for 64-bit integers.
#endif
#extension GL_AMD_gcn_shader : require
layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;

void main()
{
}