Enable MLGO for register allocation (67a2dee8) · Commits · e / os / android_build_soong

This enables Machine Learning Guided Optimizations (MLGO) for register allocation. App launch performance on oriole-userdebug is improved by 0.53%, and binary size is very slightly reduced (e.g. 64 bytes for libart.so). https://dashboards.corp.google.com/_0e1b06dd_a79e_4433_b625_b62e5cac004b?p=BootImageProfileId:36265 Test: presubmit Bug: 229056536 Change-Id: I0e5d40bb90a1555a1343f114ebffffca281f20b2

cc/config/global.go

+5 −0

Original line number	Diff line number	Diff line
		@@ -140,6 +140,9 @@ 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",
		}
		@@ -167,6 +170,8 @@ 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(deviceGlobalLdflags, commonGlobalLldflags...)