[titzer]

For Virgil, there is a switch to turn off bounds checking, for the only reason to measure their cost. (It's not expected that anyone ever do this for production code). Bounds checks do not appear to slow down any program that matters (TM) by more than 2%. That's partly because so many loops automatically have bounds checks removed by analysis. But still. It's negligible.

[dataangel]

A 2% efficiency difference is tens if not hundreds of millions of dollars for Google, Meta, etc. Globally it’s enormous.

[titzer]

And yet globally both of these companies spend 20% of CPU cycles on TLB misses. Should we turn off virtual memory protections and go back to raw physical memory (or something?)