63-bit fixnums on 64-bit targets.

[sbcl.git] / NEWS

diff --git a/NEWS b/NEWS
index 092ae07..846ce95 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,11 @@
 ;;;; -*- coding: utf-8; fill-column: 78 -*-
+changes relative to sbcl-1.0.52:
+  * enhancement: on 64-bit targets, in src/compiler/generic/early-vm.lisp,
+    the parameter n-fixnum-tag-bits may now vary from 1 (fixnum =
+    (signed-byte 63)) to 3 (fixnum = (signed-byte 61)) at build-time.
+  * minor(?) incompatible(?) change: The default fixnum width on 64-bit
+    targets is now 63 bits (up from 61).
+
 changes in sbcl-1.0.52 relative to sbcl-1.0.51:
   * enhancement: ASDF has been updated to version 2.017.
   * enhancement: the --core command line option now accepts binaries with