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Only enable MLGO for ARM64 ThinLTO targets

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The MLGO model we embed in the Android Clang is trained on ARM64
ThinLTO artefacts. Applying the model across architectures does not
necessarily translate to performance improvement. Therefore only enable
the optimisation on ARM64 ThinLTO for now.

Test: presubmit
Bug: 293827654
Change-Id: Ie64a65c11191cf700a463637a0746c8470d3aa3c
This commit is contained in:
Yi Kong
2023-11-07 14:12:51 +09:00
parent 216ed6c918
commit 0fa503da2e
2 changed files with 9 additions and 9 deletions
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5
cc/config/global.go
View File

@@ -174,9 +174,6 @@ var (
"-Werror=format-security",
"-nostdlibinc",
// Enable MLGO for register allocation.
"-mllvm -regalloc-enable-advisor=release",
// Emit additional debug info for AutoFDO
"-fdebug-info-for-profiling",
}
@@ -205,8 +202,6 @@ var (
"-Wl,--exclude-libs,libgcc_stripped.a",
"-Wl,--exclude-libs,libunwind_llvm.a",
"-Wl,--exclude-libs,libunwind.a",
// Enable MLGO for register allocation.
"-Wl,-mllvm,-regalloc-enable-advisor=release",
}
deviceGlobalLldflags = append(append(deviceGlobalLdflags, commonGlobalLldflags...),

13
cc/lto.go
View File

@@ -147,10 +147,15 @@ func (lto *lto) flags(ctx BaseModuleContext, flags Flags) Flags {
}
}
// For ML training
if ctx.Config().IsEnvTrue("THINLTO_EMIT_INDEXES_AND_IMPORTS") {
ltoLdFlags = append(ltoLdFlags, "-Wl,--save-temps=import")
ltoLdFlags = append(ltoLdFlags, "-Wl,--thinlto-emit-index-files")
// Register allocation MLGO flags for ARM64.
if ctx.Arch().ArchType == android.Arm64 {
ltoCFlags = append(ltoCFlags, "-mllvm -regalloc-enable-advisor=release")
ltoLdFlags = append(ltoLdFlags, "-Wl,-mllvm,-regalloc-enable-advisor=release")
// Flags for training MLGO model.
if ctx.Config().IsEnvTrue("THINLTO_EMIT_INDEXES_AND_IMPORTS") {
ltoLdFlags = append(ltoLdFlags, "-Wl,--save-temps=import")
ltoLdFlags = append(ltoLdFlags, "-Wl,--thinlto-emit-index-files")
}
}
flags.Local.CFlags = append(flags.Local.CFlags, ltoCFlags...)