All Super Mario 3d All-Stars Games Are Emulated; Galaxy Code Has Been Recompiled to Run Natively on the Switch CPU
https://wccftech.com/super-mario-3d-all-stars-games-emulated/
Super Mario 3D All-Stars has reportedly leaked online ahead of its official release date, and the first technical details have emerged online.
As reported by OatlmealDome on Twitter, all three games are emulated. Super Mario Galaxy and Sunshine run under an emulator called hagi, while Mario 64 runs on an unspecified Nintendo 64 emulator that uses the Vulkan API.