Godbolt shows that Clang is a lot more aggressive with use of "cmov" -- conditional move instructions.

When the Spectre and Meltdown family of security debacles surfaced, cmov was promoted as a way to choke off speculative execution. But that suggests, also, that cmov would be bad for performance in places where cross-process security isn't a concern.

Did something important change, or did I misunderstand? Maybe only cmov memory -> register blocks speculation?