Closed Bug 1433171 Opened 3 years ago Closed 8 months ago
Investigate /d2guardswtablesuppress flag in MSVC 15
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.
Status: NEW → RESOLVED
Closed: 8 months ago
Resolution: --- → WONTFIX
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