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| author | Vadim Yanitskiy <axilirator@gmail.com> | 2017-05-08 00:07:21 +0700 |
|---|---|---|
| committer | Vadim Yanitskiy <axilirator@gmail.com> | 2017-05-08 02:02:49 +0700 |
| commit | a8a5819155323be6fab2c874d4448c0c9510331e (patch) | |
| tree | 94dbaf07f2b7bea22710ccf00347592c5b1164d2 /configure.ac | |
| parent | 2c3066e5da54659f19799005eddb1d134c6d0166 (diff) | |
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
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 672a6dff..1dd5930e 100644 --- a/configure.ac +++ b/configure.ac @@ -242,6 +242,33 @@ else 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 |