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

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

[ebuild  N     ] sys-libs/zlib-ng-2.2.5::gentoo  USE="(-compat) -test" CPU_FLAGS_X86="avx2 avx512f pclmul sse2 sse4_2 ssse3 -avx512_vnni -vpclmulqdq" 2361 KiB

Total: 1 package (1 new), Size of downloads: 2361 KiB