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Enable Flow Sensitive AutoFDO

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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
This commit is contained in:
Yi Kong 2023-10-10 14:11:50 +09:00
parent 6525ee82d7
commit b33ced051a
1 changed files with 1 additions and 0 deletions
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cc/afdo.go
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@ -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.