configure: Check for the dotprod and i8mm aarch64 extensions

common/aarch64/asm.S

@@ -67,6 +67,20 @@
 #endif
 
         .arch AS_ARCH_LEVEL
+#if HAVE_AS_ARCHEXT_DOTPROD_DIRECTIVE
+#define ENABLE_DOTPROD  .arch_extension dotprod
+#define DISABLE_DOTPROD .arch_extension nodotprod
+#else
+#define ENABLE_DOTPROD
+#define DISABLE_DOTPROD
+#endif
+#if HAVE_AS_ARCHEXT_I8MM_DIRECTIVE
+#define ENABLE_I8MM  .arch_extension i8mm
+#define DISABLE_I8MM .arch_extension noi8mm
+#else
+#define ENABLE_I8MM
+#define DISABLE_I8MM
+#endif
 #if HAVE_AS_ARCHEXT_SVE_DIRECTIVE
 #define ENABLE_SVE  .arch_extension sve
 #define DISABLE_SVE .arch_extension nosve
@@ -87,6 +101,8 @@
  * the .arch level. This makes it clear if we try to assemble an instruction
  * from an unintended extension set; we only allow assmbling such instructions
  * within regions where we explicitly enable those extensions. */
+DISABLE_DOTPROD
+DISABLE_I8MM
 DISABLE_SVE
 DISABLE_SVE2
 

configure

@@ -423,9 +423,10 @@ NL="
 # list of all preprocessor HAVE values we can define
 CONFIG_HAVE="MALLOC_H ALTIVEC ALTIVEC_H MMX ARMV6 ARMV6T2 NEON AARCH64 BEOSTHREAD POSIXTHREAD WIN32THREAD THREAD LOG2F SWSCALE \
              LAVF FFMS GPAC AVS GPL VECTOREXT INTERLACED CPU_COUNT OPENCL THP LSMASH X86_INLINE_ASM AS_FUNC INTEL_DISPATCHER \
-             MSA LSX MMAP WINRT VSX ARM_INLINE_ASM STRTOK_R CLOCK_GETTIME BITDEPTH8 BITDEPTH10 SVE SVE2 ELF_AUX_INFO GETAUXVAL \
+             MSA LSX MMAP WINRT VSX ARM_INLINE_ASM STRTOK_R CLOCK_GETTIME BITDEPTH8 BITDEPTH10 ELF_AUX_INFO GETAUXVAL \
              SYSCONF SYNC_FETCH_AND_ADD \
-             AS_ARCHEXT_SVE_DIRECTIVE AS_ARCHEXT_SVE2_DIRECTIVE"
+             DOTPROD I8MM SVE SVE2 \
+             AS_ARCHEXT_DOTPROD_DIRECTIVE AS_ARCHEXT_I8MM_DIRECTIVE AS_ARCHEXT_SVE_DIRECTIVE AS_ARCHEXT_SVE2_DIRECTIVE"
 
 # parse options
 
@@ -1050,6 +1051,8 @@ if [ $asm = auto -a $ARCH = AARCH64 ] ; then
     as_check ".arch ${as_arch_level}+crc" && as_arch_level="${as_arch_level}+crc"
     define AS_ARCH_LEVEL "$as_arch_level"
 
+    as_archext_check dotprod "udot v0.4s, v0.16b, v0.16b"
+    as_archext_check i8mm    "usdot v0.4s, v0.16b, v0.16b"
     as_archext_check sve     "ptrue p0.b, vl16"
     as_archext_check sve2    "smlalb z10.s, z2.h, z1.h"
 fi