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

Calculating dependencies ... done!
Dependency resolution took 1.06 s (backtrack: 0/20).

[ebuild  N     ] x11-libs/libpciaccess-0.19::gentoo  USE="zlib -static-libs" 64 KiB
[ebuild  N     ] sys-apps/hwloc-2.12.2:0/15::gentoo  USE="X cairo cpuid pci -cuda -debug -doc -l0 -nvml -rocm (-selinux) -static-libs -svg -udev -valgrind -xml" VIDEO_CARDS="-nvidia" 5504 KiB
[ebuild  N     ] dev-cpp/tbb-2023.1.0:0/12.2.3::gentoo  USE="-test" 7542 KiB
[ebuild  N     ] media-libs/embree-4.3.3:4::gentoo  USE="raymask tbb -compact-polys -ispc -ssp -test" CPU_FLAGS_X86="avx avx2 avx512dq sse2 sse4_2" 69449 KiB

Total: 4 packages (4 new), Size of downloads: 82558 KiB