Nadav Amit of VMware has announced their (currently experimental) work on “dynamic indirect call promotion” or what they have dubbed “RELPOLINES” — not to be confused with the traditional Retpolines for “return trampolines” as one of the Spectre Variant Two software-based mitigation approaches. Relpolines is designed to have lower overhead than Retpolines…

Source: Phoronix – RELPOLINES: A New Spectre V2 Approach To Lower Overhead Of Retpolines