[pypy-commit] pypy default: document branch-prediction

[arigo]

Author: Armin Rigo <arigo at tunes.org>
Branch: 
Changeset: r91019:545406083429
Date: 2017-04-07 16:34 +0200
http://bitbucket.org/pypy/pypy/changeset/545406083429/

Log:	document branch-prediction

diff --git a/pypy/doc/whatsnew-head.rst b/pypy/doc/whatsnew-head.rst
--- a/pypy/doc/whatsnew-head.rst
+++ b/pypy/doc/whatsnew-head.rst
@@ -23,3 +23,8 @@
 PyPy support to profile native frames in vmprof.
 
 .. branch: reusing-r11
+.. branch: branch-prediction
+
+Performance tweaks in the x86 JIT-generated machine code: rarely taken
+blocks are moved off-line.  Also, the temporary register used to contain
+large constants is reused across instructions.