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Vadim Yanitskiy gerrit-no-reply at lists.osmocom.orgReview at https://gerrit.osmocom.org/2519 configure.ac: check for __builtin_cpu_supports call support The '__builtin_cpu_supports' is a GCC's built-in function which returns a positive integer if the run-time CPU supports specified SIMD feature and returns 0 otherwise. It is required for further SSE optimization of Viterbi decoder. This change adds a new check, whether compiler supports this call. See /gcc/X86-Built-in-Functions.html at gcc.gnu.org for reference. Change-Id: I5d52cfb3e8fab3eedc0293a2842708cbee0f476a --- M configure.ac 1 file changed, 27 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/19/2519/1 diff --git a/configure.ac b/configure.ac index 672a6df..1dd5930 100644 --- a/configure.ac +++ b/configure.ac @@ -242,6 +242,33 @@ AM_CONDITIONAL(HAVE_SSE4_1, false) fi +dnl Check if the compiler supports specified GCC's built-in function +AC_DEFUN([CHECK_BUILTIN_SUPPORT], [ + AC_CACHE_CHECK( + [whether ${CC} has $1 built-in], + [osmo_cv_cc_has_builtin], [ + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([], [ + __builtin_cpu_supports("sse"); + ]) + ], + [AS_VAR_SET([osmo_cv_cc_has_builtin], [yes])], + [AS_VAR_SET([osmo_cv_cc_has_builtin], [no])]) + ] + ) + + AS_IF([test yes = AS_VAR_GET([osmo_cv_cc_has_builtin])], [ + AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$1), 1, + [Define to 1 if compiler has the '$1' built-in function]) + ], [ + AC_MSG_WARN($2) + ]) +]) + +dnl Check if the compiler supports runtime SIMD detection +CHECK_BUILTIN_SUPPORT([__builtin_cpu_supports], + [Runtime SIMD detection will be disabled]) + AC_OUTPUT( libosmocore.pc libosmocodec.pc -- To view, visit https://gerrit.osmocom.org/2519 To unsubscribe, visit https://gerrit.osmocom.org/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I5d52cfb3e8fab3eedc0293a2842708cbee0f476a Gerrit-PatchSet: 1 Gerrit-Project: libosmocore Gerrit-Branch: master Gerrit-Owner: Vadim Yanitskiy <axilirator at gmail.com>