154 lines
4.8 KiB
CMake
154 lines
4.8 KiB
CMake
###############################################################################
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if (__nc_optimisation)
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return()
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endif ()
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set (__nc_optimisation TRUE)
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###############################################################################
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include (compile_flag)
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include (link_flag)
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include (canonical_host)
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###############################################################################
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option(LTO "enable link-time optimisation" OFF)
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##-----------------------------------------------------------------------------
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## Enable link-time optimisation.
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##
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## The INTERPROCEDURAL_OPTIMISATION flag is silently ignored for almost all
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## compilers. Fuck you too CMake. We have to make up for its deficiencies
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## ourselves.
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if (LTO)
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# Add the linker flags first otherwise the linker may not recognise the
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# object format
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append_link_flag("-fuse-linker-plugin")
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append_link_flag("-flto")
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# Actually enable LTO object creation, but try very hard to avoid
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# situations where we may accidentally use regular/fat objects.
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append_compile_flag("-flto")
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append_compile_flag("-fno-fat-lto-objects")
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# Throw in some optimisation flags that are LTO specific. We don't
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# particularly care about checking Debug/Release here because LTO is
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# pretty heavyweight anyway.
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append_compile_flag("-fdevirtualize-at-ltrans")
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# If we're using GCC we probably need to use gcc-{ar,nm,ranlib} so that
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# plugin support works. Ideally we'd actually do some compilation tests,
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# but... it's a royal PITA with CMake.
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if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
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set (CMAKE_AR "gcc-ar")
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set (CMAKE_NM "gcc-nm")
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set (CMAKE_RANLIB "gcc-ranlib")
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endif ()
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endif ()
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###############################################################################
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option(FRAMEPOINTER "retain the framepointer even if optimising" OFF)
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##-----------------------------------------------------------------------------
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if (FRAMEPOINTER)
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append_compile_flag("-fno-omit-frame-pointer")
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endif ()
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###############################################################################
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canonical_host()
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##-----------------------------------------------------------------------------
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if (${host_cpu} STREQUAL "x86_64")
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append_compile_flag(-mtune=generic)
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append_compile_flag(-msse)
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append_compile_flag(-msse2)
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append_compile_flag(-msahf)
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elseif (${host_cpu} STREQUAL "i686")
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append_compile_flag(-march=prescott)
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append_compile_flag(-mtune=generic)
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append_compile_flag(-mcmov)
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append_compile_flag(-mfpmath=sse)
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else ()
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message (FATAL_ERROR "unknown HOST_CPU '${host_cpu}'")
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endif ()
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###############################################################################
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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else()
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append_compile_flag(-ftree-vectorize)
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# clang vectorisation
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append_compile_flag(-fvectorize)
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append_compile_flag(-fslp-vectorize)
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# loop hosting/distribution
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append_compile_flag(-floop-nest-optimize)
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append_compile_flag(-ftree-loop-distribution)
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append_compile_flag(-ftree-loop-distribute-patterns)
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append_compile_flag(-ftree-loop-im)
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append_compile_flag(-ftree-loop-if-convert-stores)
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append_compile_flag(-fivopts)
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append_compile_flag(-funsafe-loop-optimizations)
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append_compile_flag(-floop-interchange)
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append_compile_flag(-fpredictive-commoning)
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append_compile_flag(-funswitch-loops)
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# options that require substantial time/memory
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# GCC: ipa-pta can produce broken code when using LTO
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#AS_IF([test "x$ax_cv_cxx_compiler_vendor" != "xgnu" ||
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# test "x$enable_lto" != "xyes"], [
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# AX_APPEND_COMPILE_FLAGS([-fipa-pta])
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#])
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# safety removal for performance
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append_compile_flag(-fno-stack-protector)
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endif()
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###############################################################################
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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else ()
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append_compile_flag(-fdevirtualize)
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append_compile_flag(-fdevirtualize-speculatively)
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check_link_flag(TEST_GC_SECTIONS, "-Wl,--gc-sections")
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if (TEST_LD_GC_SECTIONS)
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append_compile_flag(-fdata-sections)
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append_compile_flag(-ffunction-sections)
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append_link_flag("-Wl,--gc-sections")
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endif ()
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endif ()
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###############################################################################
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if (CMAKE_BUILD_TYPE MATCHES Debug)
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add_definitions(-DENABLE_DEBUGGING)
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add_definitions(-D_GLIBCXX_DEBUG)
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append_compile_flag(-Og)
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append_compile_flag(-Werror)
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# this was protected for xmingw32, find out why
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append_compile_flag(-fstack-protector)
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else ()
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append_compile_flag(-O2)
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append_compile_flag(-fno-rtti)
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add_definitions(-DNO_RTTI)
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add_definitions(-DNDEBUG)
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endif ()
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###############################################################################
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append_compile_flag(-g)
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append_compile_flag(-ggdb)
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