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-rw-r--r--native_client_sdk/src/doc/sdk/release-notes.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/native_client_sdk/src/doc/sdk/release-notes.rst b/native_client_sdk/src/doc/sdk/release-notes.rst
index 3c85e14..4ec487e 100644
--- a/native_client_sdk/src/doc/sdk/release-notes.rst
+++ b/native_client_sdk/src/doc/sdk/release-notes.rst
@@ -33,8 +33,20 @@ PNaCl
deprecated and will be removed in the next release. PNaCl has used libc++
(which is much more up-to-date, currently based on LLVM 3.6) as the default
since Pepper 33.
+* PNaCl's experimental `Subzero translator`_ is available for x86-32 NaCl in
+ Chrome version 43, behind a flag. To give it a try, run Chrome with the
+ ``--enable-pnacl-subzero`` commandline flag, and use the ``optlevel 0``
+ :ref:`NaCl manifest option<pnacl_nmf_optlevels>`. Application startup time
+ should be several times faster than the previous LLVM-based ``optlevel 0``
+ mode, with similar code quality. Note that x86-32 NaCl requires a 32-bit
+ Chrome. On Windows, it also requires a 32-bit Windows OS, but 64-bit Linux
+ OSes can run x86-32 NaCl. If you try it out, please send us feedback
+ on `native-client-dev`_. We are working on improvements and adding
+ new targets.
.. _`code generation bug on ARM`: https://code.google.com/p/chromium/issues/detail?id=460432
+.. _`Subzero translator`: https://chromium.googlesource.com/native_client/pnacl-subzero/+/master/README.rst
+.. _`native-client-dev`: https://groups.google.com/forum/#!forum/native-client-dev
Pepper
------