aarch64: Only enable extensions in the intended files/regions

This eases actual development of the assembly functions, by only
allowing extension instructions within the sections that explicitly
enable them, instead of having all extensions enabled everywhere.

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

libavcodec/aarch64/hevcdsp_epel_neon.S

@@ -339,6 +339,7 @@ function ff_hevc_put_hevc_epel_uni_v64_8_neon, export=1
 endfunc
 
 #if HAVE_I8MM
+ENABLE_I8MM
 
 .macro EPEL_H_HEADER
         movrel          x5, epel_filters
@@ -1963,7 +1964,7 @@ function ff_hevc_put_hevc_epel_uni_w_hv64_8_neon_i8mm, export=1
         ret
 endfunc
 
-
+DISABLE_I8MM
 #endif
 
 

libavcodec/aarch64/hevcdsp_qpel_neon.S

@@ -1558,6 +1558,7 @@ function ff_hevc_put_hevc_qpel_uni_w_v64_8_neon, export=1
 endfunc
 
 #if HAVE_I8MM
+ENABLE_I8MM
 
 .macro calc_all2
         calc            v30, v31, v16, v18, v20, v22, v24, v26, v28, v30, v17, v19, v21, v23, v25, v27, v29, v31
@@ -3395,4 +3396,5 @@ function ff_hevc_put_hevc_qpel_uni_w_hv64_8_neon_i8mm, export=1
         ret
 endfunc
 
+DISABLE_I8MM
 #endif // HAVE_I8MM

libavutil/aarch64/asm.S

@@ -41,12 +41,24 @@
 #endif
 
 #if HAVE_AS_ARCHEXT_DOTPROD_DIRECTIVE
-        .arch_extension dotprod
+#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
-        .arch_extension i8mm
+#define ENABLE_I8MM  .arch_extension i8mm
+#define DISABLE_I8MM .arch_extension noi8mm
+#else
+#define ENABLE_I8MM
+#define DISABLE_I8MM
 #endif
 
+DISABLE_DOTPROD
+DISABLE_I8MM
+
 
 /* Support macros for
  *   - Armv8.3-A Pointer Authentication and