Diffstat (limited to 'docs/ReleaseNotes.rst')
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index da86be3f96ff..6efa4813d770 100644
@@ -61,6 +61,13 @@ Non-comprehensive list of changes in this release
with LLVM option -adce-remove-loops when the loop body otherwise has
no live operations.
+* The GVNHoist pass is now enabled by default. The new pass based on Global
+ Value Numbering detects similar computations in branch code and replaces
+ multiple instances of the same computation with a unique expression. The
+ transform benefits code size and generates better schedules. GVNHoist is
+ more aggressive at -Os and -Oz, hoisting more expressions at the expense of
+ execution time degradations.
* The llvm-cov tool can now export coverage data as json. Its html output mode
has also improved.