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

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] dev-cpp/simdutf-9.2.1:0/36::gentoo  USE="-atomic-base64 -doc -test" 3417 KiB

Total: 1 package (1 new), Size of downloads: 3417 KiB