[Cronet] Enforce ARMv7 Cronet doesn't inadvertently use ARM Neon instructions

components/cronet/tools/enforce_no_neon.py

Index: components/cronet/tools/enforce_no_neon.py
diff --git a/components/cronet/tools/enforce_no_neon.py b/components/cronet/tools/enforce_no_neon.py
new file mode 100755
index 0000000000000000000000000000000000000000..2cc51b9c1d49e51234e69793b1dde01c492d6bca
--- /dev/null
+++ b/components/cronet/tools/enforce_no_neon.py
@@ -0,0 +1,23 @@
+#!/usr/bin/python
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+enforce_no_neon.py - Enforce modules do not contain ARM Neon instructions.
+"""
+
+import os
+import sys
+
+def main():
+  if len(sys.argv) != 3:
+    print 'Usage: ' + os.path.basename(sys.argv[0]) + \
+        ' path/to/ARM/toolchain files/to/check/*.o'
+    return 1
+  return os.system(os.path.join(sys.argv[1], 'bin',
+      'arm-linux-androideabi-objdump') + ' -d --no-show-raw-insn ' +
+      sys.argv[2] + ' | grep -q "vld[1-9]\\|vst[1-9]"')

[mef, 2016/06/24 20:18:08]

ls vld and vst sprinkled all over base if neon is enabled?

[pauljensen, 2016/06/27 12:58:42]

Yes.  I think they're used for things like initializing lots of memory in less
time using less code.

+
+if __name__ == '__main__':
+  sys.exit(0 if main() != 0 else -1)