Bug 1895635 - Generate optional arguments for arm64 rtcd headers by aom_config.h r=media-playback-reviewers,alwu

This patch introduces a script to generate optional arguments for arm64
rtcd headers, utilizing the configurations specified in the associated
aom_config.h file.

Depends on D209995

Differential Revision: https://phabricator.services.mozilla.com/D210227

media/libaom/generate_sources_mozbuild.py

@@ -24,13 +24,6 @@ def write_aom_config(system, arch, variables, cache_variables):
     # inherit this from the mozilla build config
     cache_variables.remove('HAVE_PTHREAD_H')
 
-    if arch == 'arm64':
-        print("Please ensure the generated arm64 rtcd headers follow the feature settings here")
-        # The features below are copied from the "ARM64_FLAVORS" in AOM_DIR/build/cmake/cpu.cmake.
-        arm64_flavors = ["NEON", "ARM_CRC32", "NEON_DOTPROD", "NEON_I8MM", "SVE", "SVE2"]
-        for flavor in arm64_flavors:
-            print("ENABLE_{}: {}, HAVE_{}: {}".format(flavor, variables['ENABLE_' + flavor], flavor, variables['HAVE_' + flavor]))
-
     outdir = os.path.join('config', system, arch, 'config')
     try:
         os.makedirs(outdir)

media/libaom/generate_sources_mozbuild.sh

@@ -56,6 +56,41 @@ function gen_rtcd_header {
     > $BASE_DIR/$LIBAOM_CONFIG_DIR/$1/config/aom_dsp_rtcd.h
 }
 
+# Generate arm64 optional arguments for *_rtcd.h files.
+# $1 - Header file directory.
+function gen_arm64_optional_args {
+  local file="$BASE_DIR/$LIBAOM_CONFIG_DIR/$1/config/aom_config.h"
+
+  # The features below are copied from the "ARM64_FLAVORS" in
+  # AOM_DIR/build/cmake/cpu.cmake.
+  local arm64_flavors=(
+    "NEON"
+    "ARM_CRC32"
+    "NEON_DOTPROD"
+    "NEON_I8MM"
+    "SVE"
+    "SVE2"
+  )
+
+  local config=""
+  local opt=""
+  local args=""
+  while read -r line; do
+    for f in "${arm64_flavors[@]}"; do
+        config="HAVE_$f "
+        if [[ $line == *"$config"* ]]; then
+            enabled=${line//*$config}
+            if [[ $enabled -eq 0 ]]; then
+                opt=$(echo $f | tr '[:upper:]' '[:lower:]')
+                args=$(echo $args; echo "--disable-$opt")
+            fi
+        fi
+    done
+  done < $file
+
+  echo $args
+}
+
 echo "Generating config files."
 python3 -m venv temp
 . temp/bin/activate
@@ -75,8 +110,7 @@ gen_rtcd_header win/ia32 x86
 
 gen_rtcd_header linux/arm armv7
 
-# TODO: Parse feature settings from the generated aom_config.h
-gen_rtcd_header mac/arm64 arm64 "--disable-sve --disable-sve2"
+gen_rtcd_header mac/arm64 arm64 "$(gen_arm64_optional_args mac/arm64)"
 
 gen_rtcd_header generic generic