These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/zycore-c-1.5.2::gentoo  USE="-doc -test" 65 KiB
[ebuild  N     ] dev-libs/zydis-4.1.1::gentoo  USE="-doc -man -test" 793 KiB

Total: 2 packages (2 new), Size of downloads: 857 KiB