113 lines
4.3 KiB
Plaintext
113 lines
4.3 KiB
Plaintext
AC_DEFUN([NC_OPTIMISATION],[
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##-------------------------------------------------------------------------
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AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
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AX_REQUIRE_DEFINED([AC_CANONICAL_HOST])
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AX_REQUIRE_DEFINED([AX_COMPILER_VENDOR])
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AX_COMPILER_VENDOR
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##-------------------------------------------------------------------------
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## Enable LTO
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AC_ARG_ENABLE([lto], [
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AS_HELP_STRING([--enable-lto], [enable link-time optimisation])
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])
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AS_IF([test "x$enable_lto" == "xyes"], [
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AS_IF([test x"${host_os}" == x"mingw32"], [
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AC_ERROR([mingw32 link-time optimisation is currently broken])
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])
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AS_IF([test "x$ax_cv_cxx_compiler_vendor" == "xgnu"], [
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AC_CHECK_TOOLS([RANLIB], [gcc-ranlib ranlib])
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AC_CHECK_TOOLS([AR], [gcc-ar ar])
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AC_CHECK_TOOLS([NM], [gcc-nm nm])
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])
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AX_APPEND_COMPILE_FLAGS([-flto], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-fno-fat-lto-objects], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-flto-odr-type-merging], [], [-Werror])
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AX_APPEND_LINK_FLAGS([-fuse-linker-plugin], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-fdevirtualize-at-ltrans], [], [-Werror])
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])
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##-------------------------------------------------------------------------
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## Enable frame pointer
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AC_ARG_ENABLE([frame-pointer], [
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AS_HELP_STRING([--enable-frame-pointer], [retain the frame pointer even if optimising])
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])
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AS_IF([test "x$enable_frame_pointer" = "xyes"], [
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AX_APPEND_COMPILE_FLAGS([-fno-omit-frame-pointer], [], [-Werror])
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])
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##-------------------------------------------------------------------------
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## Choose the most performant processor architecture and features
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AC_CANONICAL_HOST
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AS_CASE([$host_cpu],
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[x86_64], [
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AX_APPEND_COMPILE_FLAGS([-mtune=generic], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-msse], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-msse2], [], [-Werror])
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],
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[i686], [
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AX_APPEND_COMPILE_FLAGS([-march=prescott], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-mtune=generic], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-mcmov], [], [-Werror])
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],
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[AC_MSG_WARN([unknown host_cpu])]
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)
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AX_APPEND_COMPILE_FLAGS([-pipe])
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# base instruction set requirements for x86
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AX_APPEND_COMPILE_FLAGS([-mfpmath=sse], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-msahf], [], [-Werror])
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##-------------------------------------------------------------------------
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## Enable aggressive code generation optimisations
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AS_IF([test "x$enable_debugging" != "xyes"], [
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# gcc vectorisation
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AX_APPEND_COMPILE_FLAGS([-ftree-vectorize], [], [-Werror])
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# clang vectorisation
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AX_APPEND_COMPILE_FLAGS([-fvectorize], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-fslp-vectorize], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-fslp-vectorize-aggressive], [], [-Werror])
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# loop hosting/distribution
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AX_APPEND_COMPILE_FLAGS([-ftree-loop-distribute-patterns], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-ftree-loop-distribution], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-ftree-loop-if-convert-stores], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-ftree-loop-linear], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-funsafe-loop-optimizations], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-floop-interchange], [], [-Werror])
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# safety removal for performance
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AX_APPEND_COMPILE_FLAGS([-fno-stack-protector], [], [-Werror])
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])
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##-------------------------------------------------------------------------
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## Enable code size optimisations (that don't impact performance)
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## Note: we assume CXX, and that CXXLINK is g++ not ld, hence the -Wl opt
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AS_IF([test "x$enable_debugging" != "xyes"], [
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AX_APPEND_COMPILE_FLAGS([-fdevirtualize], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-fdevirtualize-speculatively], [], [-Werror])
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AX_CHECK_LINK_FLAG([-Wl,--gc-sections], [
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AX_APPEND_COMPILE_FLAGS([-fdata-sections], [], [-Werror])
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AX_APPEND_COMPILE_FLAGS([-ffunction-sections], [], [-Werror])
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AX_APPEND_LINK_FLAGS([-Wl,--gc-sections], [], [-Werror])
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])
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])
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])
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