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| author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2017-02-02 17:23:20 +0000 |
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| committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2017-02-02 17:23:20 +0000 |
| commit | 882ebb6b2415d671e654d0a0ee25a54f535d06af (patch) | |
| tree | 5993e8e396c6f1e1004827dfdabc9ca61e2f1fee /acinclude.m4 | |
| parent | dbe01262a656636d5ccd3db3860345bb416c6f71 (diff) | |
| download | mpfr-882ebb6b2415d671e654d0a0ee25a54f535d06af.tar.gz | |
[acinclude.m4] Fixed _mulx_u64 detection to avoid failures in tests
with ICC 15: we need an AC_RUN_IFELSE, not just an AC_LINK_IFELSE.
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@11251 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index a5fcfc7da..6db71d813 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -482,18 +482,22 @@ static int f (double (*func)(double)) { return 0; } ],[AC_MSG_RESULT(no)]) dnl Check if _mulx_u64 is provided -dnl Note: This intrinsic is not standard, and ideally more checks should -dnl be done to make sure that the MPFR code matches what is expected on -dnl all compilers that provide it. +dnl Note: This intrinsic is not standard. We need a run because +dnl it may be provided but not working as expected (with ICC 15, +dnl one gets an "Illegal instruction"). AC_MSG_CHECKING([for _mulx_u64]) -AC_LINK_IFELSE([AC_LANG_PROGRAM([[ +AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <immintrin.h> ]], [[ return _mulx_u64(17, 42, (unsigned long long *) 0); -]])], [ - AC_MSG_RESULT(yes) - AC_DEFINE(HAVE_MULX_U64, 1,[Have _mulx_u64 function]) -],[AC_MSG_RESULT(no)]) +]])], + [AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_MULX_U64, 1,[Have a working _mulx_u64 function]) + ], + [AC_MSG_RESULT(no) + ], + [AC_MSG_RESULT([cannot test, assume no]) + ]) LIBS="$saved_LIBS" |