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buildenv: 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.

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: I797f638573e8c3aae39c28abb157ce2ac419f3f7
This commit is contained in:
Vadim Yanitskiy 2017-05-20 01:34:34 +03:00 committed by Tom Tsou
parent 8537b90dbe
commit ee57357682
1 changed files with 27 additions and 0 deletions
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27
configure.ac
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@ -120,6 +120,33 @@ AS_IF([test "x$with_sse" != "xno"], [
AM_CONDITIONAL(HAVE_SSE4_1, false)
])
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($2)
])
])
dnl Check if the compiler supports runtime SIMD detection
CHECK_BUILTIN_SUPPORT([__builtin_cpu_supports],
[Runtime SIMD detection will be disabled])
AM_CONDITIONAL(USRP1, [test "x$with_usrp1" = "xyes"])
AM_CONDITIONAL(ARCH_ARM, [test "x$with_neon" = "xyes" || test "x$with_neon_vfpv4" = "xyes"])
AM_CONDITIONAL(ARCH_ARM_A15, [test "x$with_neon_vfpv4" = "xyes"])