configure: Add detection of assembler support for SVE/SVE2

Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -467,6 +467,8 @@ Optimization options (experts only):
   --disable-neon           disable NEON optimizations
   --disable-dotprod        disable DOTPROD optimizations
   --disable-i8mm           disable I8MM optimizations
+  --disable-sve            disable SVE optimizations
+  --disable-sve2           disable SVE2 optimizations
   --disable-inline-asm     disable use of inline assembly
   --disable-x86asm         disable use of standalone x86 assembly
   --disable-mipsdsp        disable MIPS DSP ASE R1 optimizations
@@ -2163,6 +2165,8 @@ ARCH_EXT_LIST_ARM="
     vfp
     vfpv3
     setend
+    sve
+    sve2
 "
 
 ARCH_EXT_LIST_MIPS="
@@ -2432,6 +2436,8 @@ TOOLCHAIN_FEATURES="
     as_arch_directive
     as_archext_dotprod_directive
     as_archext_i8mm_directive
+    as_archext_sve_directive
+    as_archext_sve2_directive
     as_dn_directive
     as_fpu_directive
     as_func
@@ -2752,6 +2758,8 @@ vfpv3_deps="vfp"
 setend_deps="arm"
 dotprod_deps="aarch64 neon"
 i8mm_deps="aarch64 neon"
+sve_deps="aarch64 neon"
+sve2_deps="aarch64 neon sve"
 
 map 'eval ${v}_inline_deps=inline_asm' $ARCH_EXT_LIST_ARM
 
@@ -6234,9 +6242,11 @@ 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'
 
-    archext_list="dotprod i8mm"
+    archext_list="dotprod i8mm sve sve2"
     enabled dotprod && check_archext_insn dotprod 'udot v0.4s, v0.16b, v0.16b'
     enabled i8mm    && check_archext_insn i8mm    'usdot v0.4s, v0.16b, v0.16b'
+    enabled sve     && check_archext_insn sve     'whilelt p0.s, x0, x1'
+    enabled sve2    && check_archext_insn sve2    'sqrdmulh z0.s, z0.s, z0.s'
 
     # Disable the main feature (e.g. HAVE_NEON) if neither inline nor external
     # assembly support the feature out of the box. Skip this for the features
@@ -7919,6 +7929,8 @@ if enabled aarch64; then
     echo "NEON enabled              ${neon-no}"
     echo "DOTPROD enabled           ${dotprod-no}"
     echo "I8MM enabled              ${i8mm-no}"
+    echo "SVE enabled               ${sve-no}"
+    echo "SVE2 enabled              ${sve2-no}"
 fi
 if enabled arm; then
     echo "ARMv5TE enabled           ${armv5te-no}"

ffbuild/arch.mak

@@ -3,6 +3,8 @@ OBJS-$(HAVE_ARMV6)   += $(ARMV6-OBJS)   $(ARMV6-OBJS-yes)
 OBJS-$(HAVE_ARMV8)   += $(ARMV8-OBJS)   $(ARMV8-OBJS-yes)
 OBJS-$(HAVE_VFP)     += $(VFP-OBJS)     $(VFP-OBJS-yes)
 OBJS-$(HAVE_NEON)    += $(NEON-OBJS)    $(NEON-OBJS-yes)
+OBJS-$(HAVE_SVE)     += $(SVE-OBJS)     $(SVE-OBJS-yes)
+OBJS-$(HAVE_SVE2)    += $(SVE2-OBJS)    $(SVE2-OBJS-yes)
 
 OBJS-$(HAVE_MIPSFPU)   += $(MIPSFPU-OBJS)    $(MIPSFPU-OBJS-yes)
 OBJS-$(HAVE_MIPSDSP)   += $(MIPSDSP-OBJS)    $(MIPSDSP-OBJS-yes)

libavutil/aarch64/asm.S

@@ -56,8 +56,26 @@
 #define DISABLE_I8MM
 #endif
 
+#if HAVE_AS_ARCHEXT_SVE_DIRECTIVE
+#define ENABLE_SVE  .arch_extension sve
+#define DISABLE_SVE .arch_extension nosve
+#else
+#define ENABLE_SVE
+#define DISABLE_SVE
+#endif
+
+#if HAVE_AS_ARCHEXT_SVE2_DIRECTIVE
+#define ENABLE_SVE2  .arch_extension sve2
+#define DISABLE_SVE2 .arch_extension nosve2
+#else
+#define ENABLE_SVE2
+#define DISABLE_SVE2
+#endif
+
 DISABLE_DOTPROD
 DISABLE_I8MM
+DISABLE_SVE
+DISABLE_SVE2
 
 
 /* Support macros for