hvc is designed from its core to be permanently CPU-only. Heavycoin introduces the HEFTY1 cryptographic hash function in order to thwart GPU and ASIC miners by breaking out of the SIMD paradigm. The machine instructions that comprise HEFTY1 vary depending on input data. That is, the particular instructions that are executed will not be the same for each hash guess. Thus, it impossible for a GPU or ASIC to have an advantage over a CPU.

HEFTY1 must thwart GPU and ASIC miners while also providing secure cryptographic hashing. To this end, HEFTY1 was carefully constructed by making a minimalistic extension to SHA-256's MerkleDamgård construction and experimentally validating it against FIPS 140-2 and the Dieharder statistical test suite
U can check the code on github (if u can read it) if u dont believe.