[PATCH] configure: improve aarch64 handling.

Automatically detect 64- vs. 32-bit build
like for other architectures.
Also detect NEON and VFP support correctly.
Lastly, disable inline assembly NEON code
on AARCH64 that only works on 32-bit.
---
 configure               | 26 ++++++++++++++++++++++----
 libaf/af_format.c       |  2 +-
 libaf/af_volume.c       |  2 +-
 libmpcodecs/ad_ffmpeg.c |  2 +-
 4 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/configure b/configure
index fc04a568a..af54fe83b 100755
--- a/configure
+++ b/configure
@@ -270,9 +270,16 @@ alpha() {
   esac
 }

+aarch64() {
+  case "$host_arch" in
+    aarch64*) return 0;;
+    *) return 1;;
+  esac
+}
+
 arm() {
   case "$host_arch" in
-    arm*) return 0;;
+    arm*|aarch64*) return 0;;
     *) return 1;;
   esac
 }
@@ -1895,6 +1902,9 @@ fi
 if sparc ; then
   cc_check && host_arch=sparc64 || host_arch=sparc
 fi
+if arm ; then
+  cc_check && host_arch=aarch64 || host_arch=arm
+fi
 fi

 echo "Detected operating system: $system_name"
@@ -3223,6 +3233,7 @@ if arm ; then
   if test $_armvfp = "auto" ; then
     _armvfp=no
     inline_asm_check '"fadds s0, s0, s0"' && _armvfp=yes
+    inline_asm_check '"fmadd d0,    d0,    d1,    d2"' && _armvfp=yes
   fi
   echores "$_armvfp"

@@ -3254,9 +3265,15 @@ if arm ; then
   if test $neon = "auto" ; then
     neon=no
     inline_asm_check '"vadd.i16 q0, q0, q0"' && neon=yes
+    inline_asm_check '"ext   v0.8B, v0.8B, v1.8B, #1"' && neon=yes
   fi
   echores "$neon"

+  echocheck "ARM NEON intrinsics"
+  neon_intrinsics=no
+  statement_check "arm_neon.h" "int16x8_t test = vdupq_n_s16(0)" && neon_intrinsics=yes
+  echores "$neon_intrinsics"
+
   echocheck "ARM THUMB"
   if test $armthumb = "auto" ; then
     armthumb=no
@@ -3265,7 +3282,7 @@ if arm ; then
     extra_cflags="$extra_cflags -mthumb"
     def_armthumb='#define CONFIG_THUMB 1'
   else
-    extra_cflags="$extra_cflags -marm"
+    aarch64 || extra_cflags="$extra_cflags -marm"
     def_armthumb='#define CONFIG_THUMB 0'
   fi
   echores "$armthumb"
@@ -3278,7 +3295,7 @@ if arm ; then
   echores "$_iwmmxt"
 fi

-cpuexts_all='ALTIVEC XOP AVX AVX2 AVX512 FMA3 FMA4 MMX MMX2 MMXEXT AMD3DNOW AMD3DNOWEXT SSE SSE2 SSE3 SSSE3 SSE4 SSE42 FAST_CMOV I686 FAST_CLZ ARMV5TE ARMV6 ARMV6T2 VFP VFPV3 SETEND NEON IWMMXT MMI VIS MVI'
+cpuexts_all='ALTIVEC XOP AVX AVX2 AVX512 FMA3 FMA4 MMX MMX2 MMXEXT AMD3DNOW AMD3DNOWEXT SSE SSE2 SSE3 SSSE3 SSE4 SSE42 FAST_CMOV I686 FAST_CLZ ARMV5TE ARMV6 ARMV6T2 VFP VFPV3 SETEND NEON INTRINSICS_NEON IWMMXT MMI VIS MVI'
 test "$_altivec"   = yes && cpuexts="ALTIVEC $cpuexts"
 test "$_mmx"       = yes && cpuexts="MMX $cpuexts"
 test "$_mmxext"    = yes && cpuexts="MMX2 $cpuexts"
@@ -3307,6 +3324,7 @@ test "$_armvfp"    = yes && cpuexts="VFP $cpuexts"
 test "$vfpv3"      = yes && cpuexts="VFPV3 $cpuexts"
 test "$setend"     = yes && cpuexts="SETEND $cpuexts"
 test "$neon"       = yes && cpuexts="NEON $cpuexts"
+test "$neon_intrinsics" = yes && cpuexts="INTRINSICS_NEON $cpuexts"
 test "$_iwmmxt"    = yes && cpuexts="IWMMXT $cpuexts"
 test "$_vis"       = yes && cpuexts="VIS $cpuexts"
 test "$_mvi"       = yes && cpuexts="MVI $cpuexts"
@@ -8987,6 +9005,7 @@ $(ff_config_enable "$cpuexts_all" "$cpuexts" "#" "HAVE")
 $(ff_config_enable "$cpuexts_all" "$cpuexts_external" "#" "HAVE" "_EXTERNAL")
 $(ff_config_enable "$cpuexts_all" "$cpuexts" "#" "HAVE" "_INLINE")

+#define HAVE_ARMV8 ARCH_AARCH64

 /* Blu-ray/DVD/VCD/CD */
 #define DEFAULT_CDROM_DEVICE "$default_cdrom_device"
@@ -9340,7 +9359,6 @@ $def_openssl
 #define HAVE_INLINE_ASM 1
 #define HAVE_INLINE_ASM_NONLOCAL_LABELS 1
 #define HAVE_INLINE_ASM_DIRECT_SYMBOL_REFS 1
-#define HAVE_INTRINSICS_NEON 0
 #define HAVE_ISATTY 0
 #define HAVE_LDBRX 0
 #define HAVE_LIBC_MSVCRT 0
diff --git a/libaf/af_format.c b/libaf/af_format.c
index 94109807b..46b6e1d93 100644
--- a/libaf/af_format.c
+++ b/libaf/af_format.c
@@ -494,7 +494,7 @@ static void float2int(const float* in, void* out, int len, int bps)
       ((int8_t *)out)[i] = av_clip_int8(lrintf(128.0f * in[i]));
     break;
   case(2):
-#if HAVE_NEON
+#if HAVE_NEON && !ARCH_AARCH64
     {
     const float *in_end = in + len;
     while (in < in_end - 7) {
diff --git a/libaf/af_volume.c b/libaf/af_volume.c
index 0690d58cc..e79aa25f8 100644
--- a/libaf/af_volume.c
+++ b/libaf/af_volume.c
@@ -125,7 +125,7 @@ static av_always_inline void s16_inner_loop(int16_t *data, int len, int offset,
 static av_always_inline void float_inner_loop(float *data, int len, int offset, int step, float level, int softclip)
 {
   int i;
-#if HAVE_NEON
+#if HAVE_NEON && !ARCH_AARCH64
   if (offset == 0 && step == 1 && !softclip && len >= 8)
   {
     __asm__(
diff --git a/libmpcodecs/ad_ffmpeg.c b/libmpcodecs/ad_ffmpeg.c
index ff78a4252..456be5dc9 100644
--- a/libmpcodecs/ad_ffmpeg.c
+++ b/libmpcodecs/ad_ffmpeg.c
@@ -223,7 +223,7 @@ static av_always_inline void copy_samples_planar(size_t bps,
 {
     size_t s, c, o = 0;

-#if HAVE_NEON_INLINE
+#if HAVE_NEON_INLINE && !ARCH_AARCH64
     if (nb_channels == 2 && bps == 4) {
         const unsigned char *src0 = src[0];
         const unsigned char *src1 = src[1];
--
2.20.1

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