Commit b33ced05 authored Oct 10, 2023 by Yi Kong

Enable Flow Sensitive AutoFDO

FSAFDO (Flow Sensitive AutoFDO) is an improvement over AutoFDO. It
attempts to capture and represent the flow-sensitive profile in LLVM
optimization passes with the mechanism to expose and iteratively
reload/match the profile with better precision.

Enable this for all AFDO projects so that we can capture data from the
field, and then evaluate the performance gain.

Test: presubmit
Bug: 304282732
Change-Id: I0de6b4071e4f0a75500f3ffd5171a7be5117ec86

parent 6525ee82

cc/afdo.go

+1 −0

Original line number	Diff line number	Diff line
		@@ -84,6 +84,7 @@ func (afdo *afdo) flags(ctx ModuleContext, flags Flags) Flags {
		// 3. Make the profile searchable by the build system. So it's used the next time the binary
		// is built.
		flags.Local.CFlags = append([]string{"-funique-internal-linkage-names"}, flags.Local.CFlags...)
		flags.Local.CFlags = append([]string{"-mllvm", "-enable-fs-discriminator=true"}, flags.Local.CFlags...)
		}
		if path := afdo.Properties.FdoProfilePath; path != nil {
		// The flags are prepended to allow overriding.