59 bytes, text/x-review-board-request
MSVC just put out an undocumented /d2guardswtablesuppress flag which implements switches without jump tables, removing some indirect calls. This has benefits for Spectre and CFG. Try run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=752b951751a321e05fd5b3451ff467abebe76d16
Perf results are in: https://treeherder.mozilla.org/perf.html#/compare?originalProject=mozilla-central&newProject=try&newRevision=752b951751a321e05fd5b3451ff467abebe76d16&framework=1&selectedTimeRange=172800 Kind of a mixed bag. There are a few small wins (mostly from upgrading the compiler I believe), similar to guardspecload in Bug 1429807. But there are a few sizable losses (4-11%) on some tests. And then there's the CRAZY regressions (40%) on tp6 google.
You need to log in before you can comment on or make changes to this bug.