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e0d9c58443
Add the commandline options -fprofile-instr-generate[=filename] and -profile-instr-use=filename -fprofile-instr-generate -- Add instrumentation on branches, switches, and function entry; uses LLVM's InstrProf pass. -- Link to profile runtime that writes instrumentation counters to a file. -fprofile-instr-use -- Read profile data from a file and apply branch weights to branches and switches, and annotate functions with entrycount in LLVM IR. -- Functions with low or high entrycount are marked with 'cold' or 'inlinehint'. The only statement type without PGO yet is "try-finally". A new pragma, `pragma(LDC_profile_instr, [ true | false ])`, is added to selectively disable/enable instrumentation of functions (granularity = whole functions). The runtime library ldc-profile-rt is a copy of LLVM compiler-rt lib/profile. It has to be exactly in-sync with the LLVM version, and thus we need a copy for each PGO-supported LLVM (>=3.7). import ldc.profile for a D interface to ldc-profile-rt (for example to reset execution counts after a program startup phase). The instrumentation data is mainly passed on to LLVM: function-entry counts and branch counts/probabilities. LDC marks functions as hot when "execution count is 30% of the maximum function execution count", and marks functions as cold if their count is 1% of maximum function execution count. The source of LLVM's llvm-profdata tool is hereby included in LDCs repository (different source for each LLVM version), and the binary is included in the install bin folder. The executable is named "ldc-profdata" to avoid clashing with llvm-profdata on the same machine. This is needed because profdata executable has to be in-sync with the LLVM version used to build LDC. Maintenance burden: for trunk LLVM, we have to keep ldc-profile-rt and llvm-profdata in sync. There is no diff with upstream; but because of active development there are the occasional API changes.
19 lines
591 B
CMake
19 lines
591 B
CMake
set( LDC2_BIN ${PROJECT_BINARY_DIR}/bin/${LDC_EXE} )
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set( LDCPROFDATA_BIN ${PROJECT_BINARY_DIR}/bin/${LDCPROFDATA_EXE} )
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set( LLVM_TOOLS_DIR ${LLVM_ROOT_DIR}/bin )
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set( LDC2_BIN_DIR ${PROJECT_BINARY_DIR}/bin )
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set( TESTS_IR_DIR ${CMAKE_CURRENT_SOURCE_DIR} )
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if(CMAKE_SIZEOF_VOID_P EQUAL 8)
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set( DEFAULT_TARGET_BITS 64 )
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else()
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set( DEFAULT_TARGET_BITS 32 )
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endif()
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configure_file(lit.site.cfg.in lit.site.cfg )
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configure_file(runlit.py runlit.py COPYONLY)
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add_test(NAME lit-tests
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COMMAND python runlit.py -v .
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)
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