4e6a6fc146
zeroes); if so, use it for bit-operations like opal_cube_dim and opal_hibit. Implement two versions of power-of-two. In case of opal_next_poweroftwo, this reduces the average execution time from 83 cycles to 4 cycles (Intel Nehalem, icc, -O2, inlining, measured rdtsc, with loop over 2^27 values). Numbers for other functions are similar (but of course heavily depend on the usage, e.g. opal_hibit() with a start of 4 does not save much). The bsr instruction on AMD Opteron is also not as fast. - Replace various places where the next power-of-two is computed. Tested on Intel Nehalem Cluster with openib, compilers GNU-4.6.1 and Intel-12.0.4 using mpi_testsuite -t "Collective" with 128 processes. This commit was SVN r25270.
334 строки
13 KiB
Bash
334 строки
13 KiB
Bash
dnl -*- shell-script -*-
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dnl
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dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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dnl University Research and Technology
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dnl Corporation. All rights reserved.
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dnl Copyright (c) 2004-2006 The University of Tennessee and The University
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dnl of Tennessee Research Foundation. All rights
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dnl reserved.
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dnl Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
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dnl University of Stuttgart. All rights reserved.
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dnl Copyright (c) 2004-2006 The Regents of the University of California.
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dnl All rights reserved.
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dnl Copyright (c) 2007-2009 Sun Microsystems, Inc. All rights reserved.
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dnl Copyright (c) 2008-2010 Cisco Systems, Inc. All rights reserved.
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dnl $COPYRIGHT$
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dnl
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dnl Additional copyrights may follow
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dnl
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dnl $HEADER$
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dnl
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# OPAL_SETUP_CC()
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# ---------------
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# Do everything required to setup the C compiler. Safe to AC_REQUIRE
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# this macro.
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AC_DEFUN([OPAL_SETUP_CC],[
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# AM_PROG_CC_C_O AC_REQUIREs AC_PROG_CC, so we have to be a little
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# careful about ordering here, and AC_REQUIRE these things so that
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# they get stamped out in the right order.
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AC_REQUIRE([_OMPI_START_SETUP_CC])
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AC_REQUIRE([_OMPI_PROG_CC])
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AC_REQUIRE([AM_PROG_CC_C_O])
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OMPI_C_COMPILER_VENDOR([ompi_c_vendor])
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# Check for standard headers, needed here because needed before
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# the types checks.
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AC_HEADER_STDC
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# GNU C and autotools are inconsistent about whether this is
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# defined so let's make it true everywhere for now... However, IBM
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# XL compilers on PPC Linux behave really badly when compiled with
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# _GNU_SOURCE defined, so don't define it in that situation.
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#
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# Don't use AC_GNU_SOURCE because it requires that no compiler
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# tests are done before setting it, and we need to at least do
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# enough tests to figure out if we're using XL or not.
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AS_IF([test "$ompi_cv_c_compiler_vendor" != "ibm"],
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[AH_VERBATIM([_GNU_SOURCE],
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[/* Enable GNU extensions on systems that have them. */
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#ifndef _GNU_SOURCE
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# undef _GNU_SOURCE
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#endif])
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AC_DEFINE([_GNU_SOURCE])])
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# Do we want code coverage
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if test "$WANT_COVERAGE" = "1"; then
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if test "$ompi_c_vendor" = "gnu" ; then
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# For compilers > gcc-4.x, use --coverage for
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# compiling and linking to circumvent trouble with
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# libgcov.
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CFLAGS_orig="$CFLAGS"
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LDFLAGS_orig="$LDFLAGS"
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CFLAGS="$CFLAGS_orig --coverage"
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LDFLAGS="$LDFLAGS_orig --coverage"
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OMPI_COVERAGE_FLAGS=
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AC_CACHE_CHECK([if $CC supports --coverage],
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[ompi_cv_cc_coverage],
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[AC_TRY_COMPILE([], [],
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[ompi_cv_cc_coverage="yes"],
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[ompi_cv_cc_coverage="no"])])
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if test "$ompi_cv_cc_coverage" = "yes" ; then
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OMPI_COVERAGE_FLAGS="--coverage"
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CLEANFILES="*.gcno ${CLEANFILES}"
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CONFIG_CLEAN_FILES="*.gcda *.gcov ${CONFIG_CLEAN_FILES}"
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else
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OMPI_COVERAGE_FLAGS="-ftest-coverage -fprofile-arcs"
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CLEANFILES="*.bb *.bbg ${CLEANFILES}"
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CONFIG_CLEAN_FILES="*.da *.*.gcov ${CONFIG_CLEAN_FILES}"
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fi
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CFLAGS="$CFLAGS_orig $OMPI_COVERAGE_FLAGS"
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LDFLAGS="$LDFLAGS_orig $OMPI_COVERAGE_FLAGS"
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WRAPPER_EXTRA_CFLAGS="${WRAPPER_EXTRA_CFLAGS} $OMPI_COVERAGE_FLAGS"
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WRAPPER_EXTRA_LDFLAGS="${WRAPPER_EXTRA_LDFLAGS} $OMPI_COVERAGE_FLAGS"
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OPAL_UNIQ(CFLAGS)
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OPAL_UNIQ(LDFLAGS)
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OPAL_UNIQ(WRAPPER_EXTRA_CFLAGS)
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OPAL_UNIQ(WRAPPER_EXTRA_LDFLAGS)
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AC_MSG_WARN([$OMPI_COVERAGE_FLAGS has been added to CFLAGS (--enable-coverage)])
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WANT_DEBUG=1
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else
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AC_MSG_WARN([Code coverage functionality is currently available only with GCC])
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AC_MSG_ERROR([Configure: Cannot continue])
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fi
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fi
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# Do we want debugging?
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if test "$WANT_DEBUG" = "1" -a "$enable_debug_symbols" != "no" ; then
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if test "$ompi_c_vendor" = "gnu"; then
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CFLAGS="$CFLAGS -g" # keep the -g3 for when it will become a standard option.
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else
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CFLAGS="$CFLAGS -g"
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fi
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OPAL_UNIQ(CFLAGS)
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AC_MSG_WARN([-g has been added to CFLAGS (--enable-debug)])
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fi
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# These flags are generally gcc-specific; even the
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# gcc-impersonating compilers won't accept them.
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OMPI_CFLAGS_BEFORE_PICKY="$CFLAGS"
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if test "$WANT_PICKY_COMPILER" = 1 -a "$ompi_c_vendor" = "gnu" ; then
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add="-Wall -Wundef -Wno-long-long -Wsign-compare"
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add="$add -Wmissing-prototypes -Wstrict-prototypes"
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add="$add -Wcomment -pedantic"
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# see if -Wno-long-double works...
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CFLAGS_orig="$CFLAGS"
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# CFLAGS="$CFLAGS -Wno-long-double"
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# Starting with GCC-4.4, the compiler complains about not
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# knowing -Wno-long-double, only if -Wstrict-prototypes is set, too.
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#
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# Actually, this is not real fix, as GCC will pass on any -Wno- flag,
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# have fun with the warning: -Wno-britney
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CFLAGS="$CFLAGS $add -Wno-long-double -Wstrict-prototypes"
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AC_CACHE_CHECK([if $CC supports -Wno-long-double],
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[ompi_cv_cc_wno_long_double],
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[AC_TRY_COMPILE([], [],
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[
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dnl Alright, the -Wno-long-double did not produce any errors...
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dnl Well well, try to extract a warning regarding unrecognized or ignored options
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AC_TRY_COMPILE([], [long double test;],
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[
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ompi_cv_cc_wno_long_double="yes"
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if test -s conftest.err ; then
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dnl Yes, it should be "ignor", in order to catch ignoring and ignore
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for i in invalid ignor unrecognized ; do
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$GREP -iq $i conftest.err
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if test "$?" = "0" ; then
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ompi_cv_cc_wno_long_double="no"
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break;
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fi
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done
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fi
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],
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[ompi_cv_cc_wno_long_double="no"])],
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[ompi_cv_cc_wno_long_double="no"])])
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CFLAGS="$CFLAGS_orig"
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if test "$ompi_cv_cc_wno_long_double" = "yes" ; then
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add="$add -Wno-long-double"
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fi
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add="$add -Werror-implicit-function-declaration "
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CFLAGS="$CFLAGS $add"
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OPAL_UNIQ(CFLAGS)
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AC_MSG_WARN([$add has been added to CFLAGS (--enable-picky)])
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unset add
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fi
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# See if this version of gcc allows -finline-functions and/or
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# -fno-strict-aliasing. Even check the gcc-impersonating compilers.
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if test "$GCC" = "yes"; then
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CFLAGS_orig="$CFLAGS"
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CFLAGS="$CFLAGS_orig -finline-functions"
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add=
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AC_CACHE_CHECK([if $CC supports -finline-functions],
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[ompi_cv_cc_finline_functions],
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[AC_TRY_COMPILE([], [],
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[ompi_cv_cc_finline_functions="yes"],
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[ompi_cv_cc_finline_functions="no"])])
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if test "$ompi_cv_cc_finline_functions" = "yes" ; then
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add=" -finline-functions"
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fi
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CFLAGS="$CFLAGS_orig$add"
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CFLAGS_orig="$CFLAGS"
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CFLAGS="$CFLAGS_orig -fno-strict-aliasing"
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add=
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AC_CACHE_CHECK([if $CC supports -fno-strict-aliasing],
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[ompi_cv_cc_fno_strict_aliasing],
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[AC_TRY_COMPILE([], [],
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[ompi_cv_cc_fno_strict_aliasing="yes"],
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[ompi_cv_cc_fno_strict_aliasing="no"])])
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if test "$ompi_cv_cc_fno_strict_aliasing" = "yes" ; then
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add=" -fno-strict-aliasing"
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fi
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CFLAGS="$CFLAGS_orig$add"
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OPAL_UNIQ(CFLAGS)
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AC_MSG_WARN([$add has been added to CFLAGS])
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unset add
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fi
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# Try to enable restrict keyword
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RESTRICT_CFLAGS=
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case "$ompi_c_vendor" in
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intel)
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RESTRICT_CFLAGS="-restrict"
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;;
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sgi)
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RESTRICT_CFLAGS="-LANG:restrict=ON"
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;;
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esac
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if test ! -z "$RESTRICT_CFLAGS" ; then
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CFLAGS_orig="$CFLAGS"
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CFLAGS="$CFLAGS_orig $RESTRICT_CFLAGS"
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add=
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AC_CACHE_CHECK([if $CC supports $RESTRICT_CFLAGS],
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[ompi_cv_cc_restrict_cflags],
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[AC_TRY_COMPILE([], [],
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[ompi_cv_cc_restrict_cflags="yes"],
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[ompi_cv_cc_restrict_cflags="no"])])
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if test "$ompi_cv_cc_restrict_cflags" = "yes" ; then
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add=" $RESTRICT_CFLAGS"
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fi
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CFLAGS="${CFLAGS_orig}${add}"
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OPAL_UNIQ([CFLAGS])
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if test "$add" != "" ; then
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AC_MSG_WARN([$add has been added to CFLAGS])
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fi
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unset add
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fi
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# see if the C compiler supports __builtin_expect
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AC_CACHE_CHECK([if $CC supports __builtin_expect],
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[ompi_cv_cc_supports___builtin_expect],
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[AC_TRY_LINK([],
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[void *ptr = (void*) 0;
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if (__builtin_expect (ptr != (void*) 0, 1)) return 0;],
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[ompi_cv_cc_supports___builtin_expect="yes"],
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[ompi_cv_cc_supports___builtin_expect="no"])])
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if test "$ompi_cv_cc_supports___builtin_expect" = "yes" ; then
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have_cc_builtin_expect=1
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else
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have_cc_builtin_expect=0
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fi
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AC_DEFINE_UNQUOTED([OPAL_C_HAVE_BUILTIN_EXPECT], [$have_cc_builtin_expect],
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[Whether C compiler supports __builtin_expect])
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# see if the C compiler supports __builtin_prefetch
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AC_CACHE_CHECK([if $CC supports __builtin_prefetch],
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[ompi_cv_cc_supports___builtin_prefetch],
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[AC_TRY_LINK([],
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[int ptr;
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__builtin_prefetch(&ptr,0,0);],
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[ompi_cv_cc_supports___builtin_prefetch="yes"],
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[ompi_cv_cc_supports___builtin_prefetch="no"])])
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if test "$ompi_cv_cc_supports___builtin_prefetch" = "yes" ; then
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have_cc_builtin_prefetch=1
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else
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have_cc_builtin_prefetch=0
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fi
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AC_DEFINE_UNQUOTED([OPAL_C_HAVE_BUILTIN_PREFETCH], [$have_cc_builtin_prefetch],
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[Whether C compiler supports __builtin_prefetch])
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# see if the C compiler supports __builtin_clz
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AC_CACHE_CHECK([if $CC supports __builtin_clz],
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[ompi_cv_cc_supports___builtin_clz],
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[AC_TRY_LINK([],
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[int value = 0xffff; /* we know we have 16 bits set */
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if ((8*sizeof(int)-16) != __builtin_clz(value)) return 0;],
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[ompi_cv_cc_supports___builtin_clz="yes"],
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[ompi_cv_cc_supports___builtin_clz="no"])])
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if test "$ompi_cv_cc_supports___builtin_clz" = "yes" ; then
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have_cc_builtin_clz=1
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else
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have_cc_builtin_clz=0
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fi
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AC_DEFINE_UNQUOTED([OPAL_C_HAVE_BUILTIN_CLZ], [$have_cc_builtin_clz],
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[Whether C compiler supports __builtin_clz])
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# Preload the optflags for the case where the user didn't specify
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# any. If we're using GNU compilers, use -O3 (since it GNU
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# doesn't require all compilation units to be compiled with the
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# same level of optimization -- selecting a high level of
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# optimization is not prohibitive). If we're using anything else,
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# be conservative and just use -O.
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#
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# Note: gcc-impersonating compilers accept -O3
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if test "$WANT_DEBUG" = "1"; then
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OPTFLAGS=
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else
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if test "$GCC" = yes; then
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OPTFLAGS="-O3"
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else
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OPTFLAGS="-O"
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fi
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fi
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OMPI_ENSURE_CONTAINS_OPTFLAGS("$OMPI_CFLAGS_BEFORE_PICKY")
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OMPI_CFLAGS_BEFORE_PICKY="$co_result"
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AC_MSG_CHECKING([for C optimization flags])
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OMPI_ENSURE_CONTAINS_OPTFLAGS(["$CFLAGS"])
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AC_MSG_RESULT([$co_result])
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CFLAGS="$co_result"
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])
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AC_DEFUN([_OMPI_START_SETUP_CC],[
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ompi_show_subtitle "C compiler and preprocessor"
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# $%@#!@#% AIX!! This has to be called before anything invokes the C
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# compiler.
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dnl AC_AIX
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])
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AC_DEFUN([_OMPI_PROG_CC],[
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#
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# Check for the compiler
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#
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ompi_cflags_save="$CFLAGS"
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AC_PROG_CC
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BASECC="`basename $CC`"
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CFLAGS="$ompi_cflags_save"
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AC_DEFINE_UNQUOTED(OPAL_CC, "$CC", [OMPI underlying C compiler])
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set dummy $CC
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ompi_cc_argv0=[$]2
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OPAL_WHICH([$ompi_cc_argv0], [OPAL_CC_ABSOLUTE])
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AC_SUBST(OPAL_CC_ABSOLUTE)
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])
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