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Build libLLVMSupport to generate profiling data, previously we were only compiling a very simple HelloWorld program for profiling. This speeds up building llvm with clang by 1.22x Additionally build with thin LTO instead of full as the memory requirements for fat LTO are too high with little gain.
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60 changes: 60 additions & 0 deletions
60
l/llvm/pkg/perf/build-libLLVMSupport-for-perf-training.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| diff --git a/clang/utils/perf-training/lit.cfg b/clang/utils/perf-training/lit.cfg | ||
| index 0bd06c0d44f650..b4527c602fc484 100644 | ||
| --- a/clang/utils/perf-training/lit.cfg | ||
| +++ b/clang/utils/perf-training/lit.cfg | ||
| @@ -34,8 +34,12 @@ config.test_format = lit.formats.ShTest(use_lit_shell == "0") | ||
| config.substitutions.append( ('%clang_cpp_skip_driver', ' %s %s %s ' % (cc1_wrapper, config.clang, sysroot_flags))) | ||
| config.substitutions.append( ('%clang_cpp', ' %s --driver-mode=g++ %s ' % (config.clang, sysroot_flags))) | ||
| config.substitutions.append( ('%clang_skip_driver', ' %s %s %s ' % (cc1_wrapper, config.clang, sysroot_flags))) | ||
| -config.substitutions.append( ('%clang', ' %s %s ' % (config.clang, sysroot_flags) ) ) | ||
| +config.substitutions.append( ('%clang', '%s %s ' % (config.clang, sysroot_flags) ) ) | ||
| config.substitutions.append( ('%test_root', config.test_exec_root ) ) | ||
| +config.substitutions.append( ('%cmake_generator', config.cmake_generator ) ) | ||
| +config.substitutions.append( ('%cmake', config.cmake_exe ) ) | ||
| +config.substitutions.append( ('%llvm_src_dir', config.llvm_src_dir ) ) | ||
|
|
||
| +print(config.substitutions) | ||
| config.environment['LLVM_PROFILE_FILE'] = 'perf-training-%4m.profraw' | ||
|
|
||
| diff --git a/clang/utils/perf-training/lit.site.cfg.in b/clang/utils/perf-training/lit.site.cfg.in | ||
| index fae93065a4edf2..9d279d552919ac 100644 | ||
| --- a/clang/utils/perf-training/lit.site.cfg.in | ||
| +++ b/clang/utils/perf-training/lit.site.cfg.in | ||
| @@ -8,6 +8,9 @@ config.test_exec_root = "@CMAKE_CURRENT_BINARY_DIR@" | ||
| config.test_source_root = "@CLANG_PGO_TRAINING_DATA@" | ||
| config.target_triple = "@LLVM_TARGET_TRIPLE@" | ||
| config.python_exe = "@Python3_EXECUTABLE@" | ||
| +config.cmake_exe = "@CMAKE_COMMAND@" | ||
| +config.llvm_src_dir ="@CMAKE_SOURCE_DIR@" | ||
| +config.cmake_generator ="@CMAKE_GENERATOR@" | ||
|
|
||
| # Let the main config do the real work. | ||
| lit_config.load_config(config, "@CLANG_SOURCE_DIR@/utils/perf-training/lit.cfg") | ||
| diff --git a/clang/utils/perf-training/llvm-support/build.test b/clang/utils/perf-training/llvm-support/build.test | ||
| new file mode 100644 | ||
| index 00000000000000..f29a594c846869 | ||
| --- /dev/null | ||
| +++ b/clang/utils/perf-training/llvm-support/build.test | ||
| @@ -0,0 +1,2 @@ | ||
| +RUN: %cmake -G %cmake_generator -B %t -S %llvm_src_dir -DCMAKE_C_COMPILER=%clang -DCMAKE_CXX_COMPILER=%clang -DCMAKE_CXX_FLAGS="--driver-mode=g++" -DCMAKE_BUILD_TYPE=Release | ||
| +RUN: %cmake --build %t -v --target LLVMSupport | ||
|
|
||
| From 37919a76e3d3aa9456e1c598eab28a2c1f5155bc Mon Sep 17 00:00:00 2001 | ||
| From: Tom Stellard <[email protected]> | ||
| Date: Wed, 9 Oct 2024 21:50:36 +0000 | ||
| Subject: [PATCH 2/2] Remove debug statement | ||
|
|
||
| --- | ||
| clang/utils/perf-training/lit.cfg | 1 - | ||
| 1 file changed, 1 deletion(-) | ||
|
|
||
| diff --git a/clang/utils/perf-training/lit.cfg b/clang/utils/perf-training/lit.cfg | ||
| index b4527c602fc484..654961e215da68 100644 | ||
| --- a/clang/utils/perf-training/lit.cfg | ||
| +++ b/clang/utils/perf-training/lit.cfg | ||
| @@ -40,6 +40,5 @@ config.substitutions.append( ('%cmake_generator', config.cmake_generator ) ) | ||
| config.substitutions.append( ('%cmake', config.cmake_exe ) ) | ||
| config.substitutions.append( ('%llvm_src_dir', config.llvm_src_dir ) ) | ||
|
|
||
| -print(config.substitutions) | ||
| config.environment['LLVM_PROFILE_FILE'] = 'perf-training-%4m.profraw' |
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