docs: add a note about changes in memset unrolling to 8.10.1-notes
authorArtem Pyanykh <artem.pyanykh@gmail.com>
Fri, 5 Apr 2019 10:36:32 +0000 (13:36 +0300)
committerMarge Bot <ben+marge-bot@smart-cactus.org>
Tue, 9 Apr 2019 14:30:13 +0000 (10:30 -0400)
docs/users_guide/8.10.1-notes.rst

index a6b33b8..9212dce 100644 (file)
@@ -61,6 +61,11 @@ Compiler
   :ghc-flag:`-Wredundant-record-wildcards`  which warn users when they have
   redundant or unused uses of a record wildcard match.
 
+- Calls to `memset` are now unrolled more aggressively and the
+  produced code is more efficient on `x86_64` with added support for
+  64-bit `MOV`s. In particular, `setByteArray#` calls that were not
+  optimized before, now will be. See :ghc-ticket:`16052`.
+
 Runtime system
 ~~~~~~~~~~~~~~