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| author | Ola Liljedahl <ola.liljedahl@linaro.org> | 2016-05-17 21:21:16 +0200 |
|---|---|---|
| committer | Maxim Uvarov <maxim.uvarov@linaro.org> | 2016-05-18 14:50:08 +0300 |
| commit | 6c89f9074f9b75dfcf0f3759a300773afe7768c4 (patch) | |
| tree | e815bb0ff0a81afc87806bf51197627ee0b3c0cb /configure.ac | |
| parent | 3668168090faa3bdcc70a23e9f480e04a6a24609 (diff) | |
linux-generic: odp_atomic_internal.h: add 128-bit atomics
Add detection of availability of the -mcx16 compiler flag to
the configure script. This flag is necessary on x86-64 to enable
cpmxchg16.
Implement 128-bit atomics if natively supported by the platform.
128-bit atomics are used by linux-generic timer implementation
on certain targets (e.g. x86-64) for lock-free implementation.
Signed-off-by: Ola Liljedahl <ola.liljedahl@linaro.org>
Reviewed-and-tested-by: Bill Fischofer <bill.fischofer@linaro.org>
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index c59d2d1be..7cd6670c9 100644 --- a/configure.ac +++ b/configure.ac @@ -207,6 +207,19 @@ ODP_CFLAGS="$ODP_CFLAGS -std=c99" # Extra flags for example to suppress certain warning types ODP_CFLAGS="$ODP_CFLAGS $ODP_CFLAGS_EXTRA" +######################################################################### +# Check if compiler supports cmpxchng16 +########################################################################## +my_save_cflags="$CFLAGS" +CFLAGS=-mcx16 +AC_MSG_CHECKING([whether CC supports -mcx16]) +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], + [AC_MSG_RESULT([yes])] + [ODP_CFLAGS="$ODP_CFLAGS -mcx16"], + [AC_MSG_RESULT([no])] +) +CFLAGS="$my_save_cflags" + ########################################################################## # Default include setup ########################################################################## |