aarch64: add cpuflags support for NEON and VFP

NEON and VFP are currently mandatory for all ARMv8 profiles. Both are
handled as extensions as far as cpuflags are concerned. This is
consistent with handling x86_64 which always has SSE2, but still
handles it as an extension.

7 files changed, 150 insertions, 7 deletions

diff --git a/configure b/configure
index 725b63a1f2..47b97a8a08 100755
--- a/configure
+++ b/configure
@@ -1543,8 +1543,8 @@ CMDLINE_APPEND="
 armv5te_deps="arm"
 armv6_deps="arm"
 armv6t2_deps="arm"
-neon_deps="arm"
-vfp_deps="arm"
+neon_deps_any="aarch64 arm"
+vfp_deps_any="aarch64 arm"
 vfpv3_deps="vfp"
 
 map 'eval ${v}_inline_deps=inline_asm' $ARCH_EXT_LIST_ARM
@@ -3596,7 +3596,14 @@ od -t x1 $TMPO | grep -q '42 *49 *47 *45' && enable bigendian
 
 check_inline_asm inline_asm_labels '"1:\n"'
 
-if enabled alpha; then
+if enabled aarch64; then
+    # internal assembler in clang 3.3 does not support this instruction
+    enabled neon && check_insn neon 'ext   v0.8B, v0.8B, v1.8B, #1'
+    enabled vfp  && check_insn vfp  'fmadd d0,    d0,    d1,    d2'
+
+    map 'enabled_any ${v}_external ${v}_inline || disable $v' $ARCH_EXT_LIST_ARM
+
+elif enabled alpha; then
 
     check_cflags -mieee
 
@@ -4250,6 +4257,10 @@ if enabled x86; then
     echo "EBX available             ${ebx_available-no}"
     echo "EBP available             ${ebp_available-no}"
 fi
+if enabled aarch64; then
+    echo "NEON enabled              ${neon-no}"
+    echo "VFP enabled               ${vfp-no}"
+fi
 if enabled arm; then
     echo "ARMv5TE enabled           ${armv5te-no}"
     echo "ARMv6 enabled             ${armv6-no}"
diff --git a/libavutil/aarch64/Makefile b/libavutil/aarch64/Makefile
new file mode 100644
index 0000000000..13d26a1520
--- /dev/null
+++ b/libavutil/aarch64/Makefile
@@ -0,0 +1 @@
+OBJS += aarch64/cpu.o
diff --git a/libavutil/aarch64/asm.S b/libavutil/aarch64/asm.S
new file mode 100644
index 0000000000..94e5a84583
--- /dev/null
+++ b/libavutil/aarch64/asm.S
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#ifdef __ELF__
+#   define ELF
+#else
+#   define ELF //
+#endif
+
+.macro  function name, export=0, align=2
+    .macro endfunc
+ELF     .size   \name, . - \name
+        .endfunc
+        .purgem endfunc
+    .endm
+        .text
+        .align          \align
+    .if \export
+        .global EXTERN_ASM\name
+EXTERN_ASM\name:
+    .endif
+ELF     .type   \name, %function
+        .func   \name
+\name:
+.endm
+
+.macro  const   name, align=2
+    .macro endconst
+ELF     .size   \name, . - \name
+        .purgem endconst
+    .endm
+        .section        .rodata
+        .align          \align
+\name:
+.endm
+
+.macro  movrel rd, val
+#if CONFIG_PIC
+        adrp            \rd, #:pg_hi21:\val
+        add             \rd, \rd, #:lo12:\val
+#else
+        ldr             \rd, =\val
+#endif
+.endm
diff --git a/libavutil/aarch64/cpu.c b/libavutil/aarch64/cpu.c
new file mode 100644
index 0000000000..2cc2ccd9ef
--- /dev/null
+++ b/libavutil/aarch64/cpu.c
@@ -0,0 +1,27 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/cpu.h"
+#include "libavutil/cpu_internal.h"
+#include "config.h"
+
+int ff_get_cpu_flags_aarch64(void)
+{
+    return AV_CPU_FLAG_NEON * HAVE_NEON |
+           AV_CPU_FLAG_VFP  * HAVE_VFP;
+}
diff --git a/libavutil/aarch64/cpu.h b/libavutil/aarch64/cpu.h
new file mode 100644
index 0000000000..704df48b85
--- /dev/null
+++ b/libavutil/aarch64/cpu.h
@@ -0,0 +1,29 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_AARCH64_CPU_H
+#define AVUTIL_AARCH64_CPU_H
+
+#include "config.h"
+#include "libavutil/cpu.h"
+#include "libavutil/cpu_internal.h"
+
+#define have_neon(flags) CPUEXT(flags, NEON)
+#define have_vfp(flags)  CPUEXT(flags, VFP)
+
+#endif /* AVUTIL_AARCH64_CPU_H */
diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index 25af4c5580..8c2cfb87cc 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -51,9 +51,14 @@ int av_get_cpu_flags(void)
     if (checked)
         return flags;
 
-    if (ARCH_ARM) flags = ff_get_cpu_flags_arm();
-    if (ARCH_PPC) flags = ff_get_cpu_flags_ppc();
-    if (ARCH_X86) flags = ff_get_cpu_flags_x86();
+    if (ARCH_AARCH64)
+        flags = ff_get_cpu_flags_aarch64();
+    if (ARCH_ARM)
+        flags = ff_get_cpu_flags_arm();
+    if (ARCH_PPC)
+        flags = ff_get_cpu_flags_ppc();
+    if (ARCH_X86)
+        flags = ff_get_cpu_flags_x86();
 
     flags  &= cpuflags_mask;
     checked = 1;
@@ -114,6 +119,9 @@ int av_parse_cpu_flags(const char *s)
         { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },
         { "vfpv3",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3    },    .unit = "flags" },
         { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },
+#elif ARCH_AARCH64
+        { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },
+        { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },
 #endif
         { NULL },
     };
@@ -170,7 +178,10 @@ static const struct {
     int flag;
     const char *name;
 } cpu_flag_tab[] = {
-#if   ARCH_ARM
+#if   ARCH_AARCH64
+    { AV_CPU_FLAG_NEON,      "neon"       },
+    { AV_CPU_FLAG_VFP,       "vfp"        },
+#elif ARCH_ARM
     { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },
     { AV_CPU_FLAG_ARMV6,     "armv6"      },
     { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },
diff --git a/libavutil/cpu_internal.h b/libavutil/cpu_internal.h
index 08f6e858db..3bfe8a82d8 100644
--- a/libavutil/cpu_internal.h
+++ b/libavutil/cpu_internal.h
@@ -26,6 +26,7 @@
 
 #define CPUEXT(flags, cpuext) CPUEXT_SUFFIX(flags, , cpuext)
 
+int ff_get_cpu_flags_aarch64(void);
 int ff_get_cpu_flags_arm(void);
 int ff_get_cpu_flags_ppc(void);
 int ff_get_cpu_flags_x86(void);