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annotate src/fftw-3.3.5/m4/ax_cc_maxopt.m4 @ 83:ae30d91d2ffe

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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 2cd0e3b3e1fd
children
rev   line source
Chris@42 1 dnl @synopsis AX_CC_MAXOPT
Chris@42 2 dnl @summary turn on optimization flags for the C compiler
Chris@42 3 dnl @category C
Chris@42 4 dnl
Chris@42 5 dnl Try to turn on "good" C optimization flags for various compilers
Chris@42 6 dnl and architectures, for some definition of "good". (In our case,
Chris@42 7 dnl good for FFTW and hopefully for other scientific codes. Modify
Chris@42 8 dnl as needed.)
Chris@42 9 dnl
Chris@42 10 dnl The user can override the flags by setting the CFLAGS environment
Chris@42 11 dnl variable.
Chris@42 12 dnl
Chris@42 13 dnl Note also that the flags assume that ANSI C aliasing rules are
Chris@42 14 dnl followed by the code (e.g. for gcc's -fstrict-aliasing), and that
Chris@42 15 dnl floating-point computations can be re-ordered as needed.
Chris@42 16 dnl
Chris@42 17 dnl Requires macros: AX_CHECK_COMPILER_FLAGS, AX_COMPILER_VENDOR,
Chris@42 18 dnl
Chris@42 19 dnl @version 2011-06-22
Chris@42 20 dnl @license GPLWithACException
Chris@42 21 dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
Chris@42 22 AC_DEFUN([AX_CC_MAXOPT],
Chris@42 23 [
Chris@42 24 AC_REQUIRE([AC_PROG_CC])
Chris@42 25 AC_REQUIRE([AX_COMPILER_VENDOR])
Chris@42 26 AC_REQUIRE([AC_CANONICAL_HOST])
Chris@42 27
Chris@42 28 # Try to determine "good" native compiler flags if none specified via CFLAGS
Chris@42 29 if test "$ac_test_CFLAGS" != "set"; then
Chris@42 30 CFLAGS=""
Chris@42 31 case $ax_cv_c_compiler_vendor in
Chris@42 32 dec) CFLAGS="-newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host"
Chris@42 33 ;;
Chris@42 34
Chris@42 35 sun) CFLAGS="-native -fast -xO5 -dalign"
Chris@42 36 ;;
Chris@42 37
Chris@42 38 hp) CFLAGS="+Oall +Optrs_ansi +DSnative"
Chris@42 39 ;;
Chris@42 40
Chris@42 41 ibm) xlc_opt="-qarch=auto -qtune=auto"
Chris@42 42 AX_CHECK_COMPILER_FLAGS($xlc_opt,
Chris@42 43 CFLAGS="-O3 -qalias=ansi -w $xlc_opt",
Chris@42 44 [CFLAGS="-O3 -qalias=ansi -w"])
Chris@42 45 ;;
Chris@42 46
Chris@42 47 intel) CFLAGS="-O3"
Chris@42 48 # Intel seems to have changed the spelling of this flag recently
Chris@42 49 icc_ansi_alias="unknown"
Chris@42 50 for flag in -ansi-alias -ansi_alias; do
Chris@42 51 AX_CHECK_COMPILER_FLAGS($flag, [icc_ansi_alias=$flag; break])
Chris@42 52 done
Chris@42 53 if test "x$icc_ansi_alias" != xunknown; then
Chris@42 54 CFLAGS="$CFLAGS $icc_ansi_alias"
Chris@42 55 fi
Chris@42 56 AX_CHECK_COMPILER_FLAGS(-malign-double, CFLAGS="$CFLAGS -malign-double")
Chris@42 57 # We used to check for architecture flags here, e.g. -xHost etc.,
Chris@42 58 # but these flags are problematic. On icc-12.0.0, "-mavx -xHost"
Chris@42 59 # overrides -mavx with -xHost, generating SSE2 code instead of AVX
Chris@42 60 # code. ICC does not seem to support -mtune=host or equivalent
Chris@42 61 # non-ABI changing flag.
Chris@42 62 ;;
Chris@42 63
Chris@42 64 clang)
Chris@42 65 CFLAGS="-O3 -fomit-frame-pointer"
Chris@42 66 AX_CHECK_COMPILER_FLAGS(-mtune=native, CFLAGS="$CFLAGS -mtune=native")
Chris@42 67 AX_CHECK_COMPILER_FLAGS(-fstrict-aliasing,CFLAGS="$CFLAGS -fstrict-aliasing")
Chris@42 68 AX_CHECK_COMPILER_FLAGS(-ffast-math, CFLAGS="$CFLAGS -ffast-math")
Chris@42 69 ;;
Chris@42 70
Chris@42 71 gnu)
Chris@42 72 # Default optimization flags for gcc on all systems.
Chris@42 73 # Somehow -O3 does not imply -fomit-frame-pointer on ia32
Chris@42 74 CFLAGS="-O3 -fomit-frame-pointer"
Chris@42 75
Chris@42 76 # tune for the host by default
Chris@42 77 AX_CHECK_COMPILER_FLAGS(-mtune=native, CFLAGS="$CFLAGS -mtune=native")
Chris@42 78
Chris@42 79 # -malign-double for x86 systems
Chris@42 80 AX_CHECK_COMPILER_FLAGS(-malign-double, CFLAGS="$CFLAGS -malign-double")
Chris@42 81
Chris@42 82 # -fstrict-aliasing for gcc-2.95+
Chris@42 83 AX_CHECK_COMPILER_FLAGS(-fstrict-aliasing,
Chris@42 84 CFLAGS="$CFLAGS -fstrict-aliasing")
Chris@42 85
Chris@42 86 # -fno-schedule-insns is pretty much required on all risc
Chris@42 87 # processors.
Chris@42 88 #
Chris@42 89 # gcc performs one pass of instruction scheduling, then a pass of
Chris@42 90 # register allocation, then another pass of instruction
Chris@42 91 # scheduling. The first pass reorders instructions in a way that
Chris@42 92 # is pretty much the worst possible for the purposes of register
Chris@42 93 # allocation. We disable the first pass.
Chris@42 94 AX_CHECK_COMPILER_FLAGS(-fno-schedule-insns, CFLAGS="$CFLAGS -fno-schedule-insns")
Chris@42 95
Chris@42 96 # note that we enable "unsafe" fp optimization with other compilers, too
Chris@42 97 AX_CHECK_COMPILER_FLAGS(-ffast-math, CFLAGS="$CFLAGS -ffast-math")
Chris@42 98
Chris@42 99 # flags to enable power ISA 2.07 instructions with gcc (always true with vsx)
Chris@42 100 if test "$have_vsx" = "yes"; then
Chris@42 101 AX_CHECK_COMPILER_FLAGS(-mcpu=power8, CFLAGS="$CFLAGS -mcpu=power8")
Chris@42 102 AX_CHECK_COMPILER_FLAGS(-mpower8-fusion, CFLAGS="$CFLAGS -mpower8-fusion")
Chris@42 103 AX_CHECK_COMPILER_FLAGS(-mpower8-vector, CFLAGS="$CFLAGS -mpower8-vector")
Chris@42 104 AX_CHECK_COMPILER_FLAGS(-mdirect-move, CFLAGS="$CFLAGS -mdirect-move")
Chris@42 105 fi
Chris@42 106 ;;
Chris@42 107 esac
Chris@42 108
Chris@42 109 if test -z "$CFLAGS"; then
Chris@42 110 echo ""
Chris@42 111 echo "********************************************************"
Chris@42 112 echo "* WARNING: Don't know the best CFLAGS for this system *"
Chris@42 113 echo "* Use ./configure CFLAGS=... to specify your own flags *"
Chris@42 114 echo "* (otherwise, a default of CFLAGS=-O3 will be used) *"
Chris@42 115 echo "********************************************************"
Chris@42 116 echo ""
Chris@42 117 CFLAGS="-O3"
Chris@42 118 fi
Chris@42 119
Chris@42 120 AX_CHECK_COMPILER_FLAGS($CFLAGS, [], [
Chris@42 121 echo ""
Chris@42 122 echo "********************************************************"
Chris@42 123 echo "* WARNING: The guessed CFLAGS don't seem to work with *"
Chris@42 124 echo "* your compiler. *"
Chris@42 125 echo "* Use ./configure CFLAGS=... to specify your own flags *"
Chris@42 126 echo "********************************************************"
Chris@42 127 echo ""
Chris@42 128 CFLAGS=""
Chris@42 129 ])
Chris@42 130
Chris@42 131 fi
Chris@42 132 ])