After doing some benchmark or source code reading you'll find out that the author was just lying about its performance, since he even lacks basic knowledge of G

After doing some benchmark or source code reading you'll find out that the author was just lying about its performance, since he even lacks basic knowledge of GPGPU optimization techniques and made wrong use of isl to generate low quality but obfuscated OpenCL kernel code, which is hard to see through at first. Also he mistook "S-expression" for lisp, which is ridiculous.