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Commit 9723e338 authored by Yi Kong's avatar Yi Kong
Browse files

Do not perform AFDO or optimizing LTO for eng builds 

Afdo creates more variants to build, and optimizing LTO is costly to
perform. Turn off these two optimizations for eng builds for a faster
build speed.

This reduces total C/C++ invocation time for aosp_arm64-eng by 6.28%.

Test: presubmit
Bug: 307753064
Change-Id: Ibac4269c66a64e896dba2074b607d71a2da37546
parent 198583ed

cc/afdo.go

+7 −0
Original line number Diff line number Diff line
@@ -64,6 +64,13 @@ func (afdo *afdo) props() []interface{} { 
	return []interface{}{&afdo.Properties}

}



func (afdo *afdo) begin(ctx BaseModuleContext) {

	// Disable on eng builds for faster build.

	if ctx.Config().Eng() {

		afdo.Properties.Afdo = false

	}

}



// afdoEnabled returns true for binaries and shared libraries

// that set afdo prop to True and there is a profile available

func (afdo *afdo) afdoEnabled() bool {

cc/cc.go

+3 −0
Original line number Diff line number Diff line
@@ -2401,6 +2401,9 @@ func (c *Module) begin(ctx BaseModuleContext) { 
	if c.coverage != nil {

		c.coverage.begin(ctx)

	}

	if c.afdo != nil {

		c.afdo.begin(ctx)

	}

	if c.lto != nil {

		c.lto.begin(ctx)

	}

cc/lto.go

+2 −1
Original line number Diff line number Diff line
@@ -116,7 +116,8 @@ func (lto *lto) flags(ctx BaseModuleContext, flags Flags) Flags { 
		// better dead code elimination and CFG simplification, but do

		// not perform costly optimizations for a balance between compile

		// time, binary size and performance.

		if !lto.ThinLTO() {

		// Apply the same for Eng builds as well.

		if !lto.ThinLTO() || ctx.Config().Eng() {

			ltoLdFlags = append(ltoLdFlags, "-Wl,--lto-O0")

		}