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| author | Andreas Schwab <schwab@linux-m68k.org> | 2012-03-16 16:07:57 +0100 |
|---|---|---|
| committer | Andreas Schwab <schwab@linux-m68k.org> | 2012-03-21 23:58:50 +0100 |
| commit | 7998fa7899a29803ad4512002636332dfee48451 (patch) | |
| tree | ab1e75e83dd8478f276b2fbf87b192732f83548d /configure.in | |
| parent | 8e95c99a7a0b0ca8cf9bfbeddf1e43fb3efc1bee (diff) | |
| download | glibc-7998fa7899a29803ad4512002636332dfee48451.tar.gz glibc-7998fa7899a29803ad4512002636332dfee48451.tar.xz glibc-7998fa7899a29803ad4512002636332dfee48451.zip | |
Disable use of FMA instructions in branred
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/configure.in b/configure.in index b2fed4bd1c..2363015edb 100644 --- a/configure.in +++ b/configure.in @@ -1992,6 +1992,14 @@ if test "$libc_cv_gcc_tls_model_attr" = no; then AC_MSG_ERROR([support for the tls_model attribute is required]) fi +dnl Determine how to disable generation of FMA instructions. +AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions], + libc_cv_cc_nofma, [dnl +libc_cv_cc_nofma= +for opt in -ffp-contract=off -mno-fused-madd; do + LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break]) +done]) + if test -n "$submachine"; then AC_CACHE_CHECK([for compiler option for CPU variant], libc_cv_cc_submachine, [dnl @@ -2135,6 +2143,7 @@ AC_SUBST(libc_cv_cc_avx) AC_SUBST(libc_cv_cc_sse2avx) AC_SUBST(libc_cv_cc_novzeroupper) AC_SUBST(libc_cv_cc_fma4) +AC_SUBST(libc_cv_cc_nofma) AC_SUBST(libc_cv_as_i686) AC_SUBST(libc_cv_sparc_as_vis3) |