gencgc: Reduce conservatism for pointers to unboxed pages.

[sbcl.git] / NEWS

diff --git a/NEWS b/NEWS
index 75355ee..5977d64 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,10 @@ changes relative to sbcl-1.1.14:
   * enhancement: sb-ext:save-lisp-and-die on Windows now accepts
     :application-type argument, which can be :console or :gui. :gui allows
     having GUI applications without an automatically appearing console window.
+  * enhancement: reduced conservativism on GENCGC platforms:
+    conservative roots that point to unboxed pages must be tagged
+    pointers to the start of a valid-looking object, not merely point
+    to within the allocated part of the page, in order to pin the page.
   * bug fix: Windows applications without the console window no longer misbehave.
     (patch by Wilfredo Velazquez, lp#1256034).
   * bug fix: modular arithmetic optimizations do not stumble on dead branches