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autotools: make it possible to forcibly disable neon.

This commit is contained in:
Cedric Bail 2014-05-08 16:24:04 +02:00
parent 0b97c11ea2
commit 79c4baf1cc
1 changed files with 30 additions and 17 deletions
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47
configure.ac
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@ -477,6 +477,17 @@ build_cpu_sse3="no"
build_cpu_altivec="no" build_cpu_altivec="no"
build_cpu_neon="no" build_cpu_neon="no"
want_neon="yes"
AC_ARG_ENABLE([neon],
[AC_HELP_STRING([--disable-neon], [disable neon support @<:@default=enable@:>@])],
[
if test "x${enableval}" = "xyes"; then
want_neon="yes"
else
want_neon="no"
fi
])
SSE3_CFLAGS="" SSE3_CFLAGS=""
ALTIVEC_CFLAGS="" ALTIVEC_CFLAGS=""
NEON_CFLAGS="" NEON_CFLAGS=""
@ -541,23 +552,25 @@ case $host_cpu in
fi fi
;; ;;
arm*) arm*)
build_cpu_neon="yes" if test "x${want_neon}" = "xyes"; then
AC_MSG_CHECKING([whether to use NEON instructions]) build_cpu_neon="yes"
CFLAGS_save="${CFLAGS}" AC_MSG_CHECKING([whether to use NEON instructions])
CFLAGS="${CFLAGS} -mfpu=neon" CFLAGS_save="${CFLAGS}"
AC_TRY_COMPILE([#include <arm_neon.h>], CFLAGS="${CFLAGS} -mfpu=neon"
[asm volatile ("vqadd.u8 d0, d1, d0\n")], AC_TRY_COMPILE([#include <arm_neon.h>],
[ [asm volatile ("vqadd.u8 d0, d1, d0\n")],
AC_MSG_RESULT([yes]) [
AC_DEFINE([BUILD_NEON], [1], [Build NEON Code]) AC_MSG_RESULT([yes])
build_cpu_neon="yes" AC_DEFINE([BUILD_NEON], [1], [Build NEON Code])
NEON_CFLAGS="-mfpu=neon" build_cpu_neon="yes"
], NEON_CFLAGS="-mfpu=neon"
[ ],
AC_MSG_RESULT([no]) [
build_cpu_neon="no" AC_MSG_RESULT([no])
]) build_cpu_neon="no"
CFLAGS="${CFLAGS_save}" ])
CFLAGS="${CFLAGS_save}"
fi
;; ;;
esac esac