mirror of
https://github.com/dart-lang/sdk
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2a2781edff
This pragma forces compiler to align loop headers within the function by architecture specific boundary: 32 bytes on X64 and ARM64 (with the exception of Apple Silicon, which explicitly discourages aligning branch targets in the optimization manual). Current implementation is rather naive and does not do any attempt to decide whether aligning is actually profitable based on loop body itself. I have found this pragma to be helpful both to stabilize benchmark results and achieve better performance for tight loops on Intel hardware. Issue https://github.com/dart-lang/sdk/issues/55522 TEST=vm/dart/align_loops_test Cq-Include-Trybots: luci.dart.try:vm-aot-linux-product-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-linux-debug-x64-try,vm-aot-linux-release-arm64-try,vm-aot-linux-release-simarm_x64-try,vm-aot-linux-release-x64-try,vm-aot-mac-product-arm64-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-win-release-x64-try,vm-aot-win-debug-arm64-try,vm-aot-win-debug-x64-try,vm-aot-win-debug-x64c-try,vm-aot-win-product-x64-try,vm-aot-win-release-arm64-try,vm-aot-linux-debug-simarm_x64-try,vm-aot-linux-debug-simriscv64-try,vm-aot-dwarf-linux-product-x64-try,vm-aot-android-release-arm64c-try,vm-aot-android-release-arm_x64-try Change-Id: Ic22fb90d85e7fdebeeaa3908a43328c59436ab58 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/364121 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Slava Egorov <vegorov@google.com> |
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| .. | ||
| bots | ||
| buildtools | ||
| dart2js | ||
| dom | ||
| fuchsia | ||
| linux_dist_support | ||
| package_deps | ||
| patches | ||
| sdks | ||
| spec_parser | ||
| test_generators | ||
| testing | ||
| verify_docs | ||
| .gitignore | ||
| 3xhead_flutter_hooks.sh | ||
| addlatexhash.dart | ||
| analysis_options.yaml | ||
| bisect.dart | ||
| build.py | ||
| copy_dart.py | ||
| copy_tree.py | ||
| create_pkg_manifest.py | ||
| diff_results.dart | ||
| download_chromium_sysroot.sh | ||
| experimental_features.yaml | ||
| FAKE_COMMITS | ||
| find_builders.dart | ||
| find_depot_tools.py | ||
| gen_fuchsia_test_manifest.py | ||
| generate_buildfiles.py | ||
| generate_experimental_flags.dart | ||
| generate_idefiles.py | ||
| generate_package_config.dart | ||
| generate_package_config.py | ||
| generate_sdk_version_file.py | ||
| generate_shim_headers.py | ||
| get_dot_git_folder.py | ||
| git_cl_try.sh | ||
| gn.py | ||
| gn_helpers.py | ||
| line_doc_comments.dart | ||
| list_dart_files.py | ||
| list_dart_files_as_depfile.py | ||
| make_version.py | ||
| manage_deps.dart | ||
| minidump.py | ||
| opt_out_files.dart | ||
| OWNERS | ||
| OWNERS_ANALYZER | ||
| OWNERS_BUILD | ||
| OWNERS_CFE | ||
| OWNERS_DEVTOOLS | ||
| OWNERS_ECOSYSTEM | ||
| OWNERS_ENG | ||
| OWNERS_FOUNDATION | ||
| OWNERS_GOOGLE3 | ||
| OWNERS_INFRA | ||
| OWNERS_LANGUAGE | ||
| OWNERS_PRODUCT | ||
| OWNERS_PUB | ||
| OWNERS_VM | ||
| OWNERS_WASM | ||
| OWNERS_WEB | ||
| presubmit.sh | ||
| publish_pkg.py | ||
| rev_sdk_deps.dart | ||
| run_offsets_extractor.dart | ||
| run_with_coredumps_enabled.py | ||
| set_ia32_sysroot.sh | ||
| set_x64_sysroot.sh | ||
| spec_parse.py | ||
| task_kill.py | ||
| test.dart | ||
| test.py | ||
| utils.py | ||
| validate_test_matrix.dart | ||
| VERSION | ||
| write_dartdoc_options_file.py | ||
| write_revision_file.py | ||
| write_version_file.py | ||
| yaml2json.dart | ||