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PGO optimizations
This commit is contained in:
Alexander Frick
parent
c3ccda485c
commit
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8 changed files with 190 additions and 7 deletions
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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@ -1,4 +1,4 @@
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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@ -1,4 +1,4 @@
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# Copyright 2024 The Chromium Authors and Alex313031
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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183
src/build/config/compiler/pgo/BUILD.gn
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183
src/build/config/compiler/pgo/BUILD.gn
Normal file
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# Copyright 2024 The Chromium Authors, RobRich999, and Alex313031
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import("//build/config/chromeos/ui_mode.gni")
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import("//build/config/clang/clang.gni")
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import("//build/config/compiler/compiler.gni")
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import("//build/config/compiler/pgo/pgo.gni")
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import("//build/config/features.gni")
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import("//build/toolchain/toolchain.gni")
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# Configuration that enables PGO instrumentation.
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config("pgo_instrumentation_flags") {
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visibility = [ ":default_pgo_flags" ]
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# Only add flags when chrome_pgo_phase == 1, so that variables we would use
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# are not required to be defined when we're not actually using PGO.
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if (chrome_pgo_phase == 1 && is_clang && !is_nacl && is_a_target_toolchain) {
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cflags = [ "-fprofile-generate" ]
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if (!is_win) {
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# Windows directly calls link.exe instead of the compiler driver when
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# linking, and embeds the path to the profile runtime library as
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# dependent library into each object file.
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ldflags = [ "-fprofile-generate" ]
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}
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}
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}
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# Configuration that enables optimization using profile data.
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config("pgo_optimization_flags") {
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visibility = [ ":default_pgo_flags" ]
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# Only add flags when chrome_pgo_phase == 2, so that variables we would use
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# are not required to be defined when we're not actually using PGO.
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if (chrome_pgo_phase == 2 && is_clang && !is_nacl && is_a_target_toolchain) {
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_pgo_target = ""
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# There are txt files used by //tools/update_pgo_profiles.py to decide which
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# profiles to use, adding them as inputs so that analyzer recognizes the
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# dependencies.
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inputs = []
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if (is_win) {
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if (target_cpu == "arm64") {
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_pgo_target = "win-arm64"
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} else if (target_cpu == "x64") {
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_pgo_target = "win64"
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} else {
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_pgo_target = "win32"
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}
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} else if (is_mac) {
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if (target_cpu == "arm64") {
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_pgo_target = "mac-arm"
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} else {
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_pgo_target = "mac"
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}
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} else if (is_linux) {
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_pgo_target = "linux"
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} else if (is_chromeos_lacros) {
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if (target_cpu == "arm") {
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# We don't have the arm device to train arm pgo data. So Lacros arm
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# would use arm64 profile.
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_pgo_target = "lacros-arm64"
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} else if (target_cpu == "arm64") {
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_pgo_target = "lacros-arm64"
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} else {
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_pgo_target = "lacros64"
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}
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} else if (is_android) {
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# Use |current_cpu| and not |target_cpu|; for Android we may built both.
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if (current_cpu == "arm64") {
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_pgo_target = "android-arm64"
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} else {
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_pgo_target = "android-arm32"
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}
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} else if (is_fuchsia) {
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if (target_cpu == "arm64") {
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_pgo_target = "mac-arm"
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} else {
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_pgo_target = "mac"
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}
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} else if (is_ios && use_blink) {
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if (target_cpu == "arm64") {
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_pgo_target = "mac-arm"
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} else {
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_pgo_target = "mac"
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}
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}
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if (_pgo_target == "win-arm64") {
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inputs = [ "//chrome/build/win-arm64.pgo.txt" ]
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} else if (_pgo_target == "win64") {
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inputs = [ "//chrome/build/win64.pgo.txt" ]
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} else if (_pgo_target == "win32") {
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inputs = [ "//chrome/build/win32.pgo.txt" ]
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} else if (_pgo_target == "mac-arm") {
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inputs = [ "//chrome/build/mac-arm.pgo.txt" ]
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} else if (_pgo_target == "mac") {
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inputs = [ "//chrome/build/mac.pgo.txt" ]
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} else if (_pgo_target == "linux") {
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inputs = [ "//chrome/build/linux.pgo.txt" ]
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} else if (_pgo_target == "lacros64") {
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inputs = [ "//chrome/build/lacros64.pgo.txt" ]
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} else if (_pgo_target == "lacros-arm") {
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inputs = [ "//chrome/build/lacros-arm.pgo.txt" ]
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} else if (_pgo_target == "lacros-arm64") {
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inputs = [ "//chrome/build/lacros-arm64.pgo.txt" ]
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} else if (_pgo_target == "android-arm32") {
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inputs = [ "//chrome/build/android-arm32.pgo.txt" ]
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} else if (_pgo_target == "android-arm64") {
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inputs = [ "//chrome/build/android-arm64.pgo.txt" ]
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}
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if (_pgo_target != "" && pgo_data_path == "") {
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pgo_data_path = exec_script("//tools/update_pgo_profiles.py",
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[
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"--target",
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_pgo_target,
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"get_profile_path",
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],
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"value")
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}
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assert(pgo_data_path != "",
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"Please set pgo_data_path to point at the profile data")
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cflags = [
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"-fprofile-use=" + rebase_path(pgo_data_path, root_build_dir),
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# It's possible to have some profile data legitimately missing,
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# and at least some profile data always ends up being considered
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# out of date, so make sure we don't error for those cases.
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"-Wno-profile-instr-unprofiled",
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"-Wno-profile-instr-out-of-date",
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# Some hashing conflict results in a lot of warning like this when doing
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# a PGO build:
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# warning: foo.cc: Function control flow change detected (hash mismatch)
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# [-Wbackend-plugin]
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# See https://crbug.com/978401
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"-Wno-backend-plugin",
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]
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# Enable basic block layout based on the extended TSP problem. This aims to
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# improve icache utilization and reduce the binary size.
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if (use_thin_lto) {
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if (is_win) {
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ldflags = [
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"-mllvm:-enable-ext-tsp-block-placement"
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"-mllvm:-enable-split-machine-functions"
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]
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} else {
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ldflags = [
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"-Wl,-mllvm,-enable-ext-tsp-block-placement",
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"-Wl,-mllvm,-enable-split-machine-functions",
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]
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}
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} else {
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if (is_win) {
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cflags += [
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"-mllvm", "-enable-ext-tsp-block-placement",
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"-fsplit-machine-functions",
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]
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} else {
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cflags += [
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"-mllvm", "-enable-ext-tsp-block-placement",
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"-fsplit-machine-functions",
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]
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}
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}
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}
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}
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# Applies flags necessary when profile-guided optimization is used.
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# Flags are only added if PGO is enabled, so that this config is safe to
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# include by default.
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config("default_pgo_flags") {
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if (chrome_pgo_phase == 0) {
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# Nothing. This config should be a no-op when chrome_pgo_phase == 0.
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} else if (chrome_pgo_phase == 1) {
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configs = [ ":pgo_instrumentation_flags" ]
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} else if (chrome_pgo_phase == 2) {
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configs = [ ":pgo_optimization_flags" ]
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}
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}
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