0.8alpha.0.21:

[sbcl.git] / doc / intro.sgml

diff --git a/doc/intro.sgml b/doc/intro.sgml
index 704532f..cc11eb3 100644 (file)
--- a/doc/intro.sgml
+++ b/doc/intro.sgml
@@ -107,9 +107,9 @@ known bugs, known performance problems, and missing extensions are
 likely to be fixed, tuned, or added. </para>
 
 <para>&SBCL; is descended from &CMUCL;, which is itself descended from
 likely to be fixed, tuned, or added. </para>
 
 <para>&SBCL; is descended from &CMUCL;, which is itself descended from

-Spice Lisp. Early implementations for the Mach operating system on the
-IBM RT, back in the 1980s. Design decisions from that time are still
-reflected in the current implementation:
+Spice Lisp, including early implementations for the Mach operating
+system on the IBM RT, back in the 1980s. Design decisions from that
+time are still reflected in the current implementation:

 <itemizedlist>
   <listitem><para>The system expects to be loaded into a 
     fixed-at-compile-time location in virtual memory, and also expects
 <itemizedlist>
   <listitem><para>The system expects to be loaded into a 
     fixed-at-compile-time location in virtual memory, and also expects

@@ -122,7 +122,8 @@ reflected in the current implementation:
   <listitem><para>A word is a 32-bit quantity. The system has been 
     ported to many processor architectures without altering this
     basic principle. Some hacks allow the system to run on the Alpha
   <listitem><para>A word is a 32-bit quantity. The system has been 
     ported to many processor architectures without altering this
     basic principle. Some hacks allow the system to run on the Alpha

-    chip (a 64-bit architecture) but the assumption that a word is
+    chip (a 64-bit architecture) but even there 32-bit words are
+    used. The assumption that a word is

     32 bits wide is implicit in hundreds of places in the
     system.</para></listitem>
   <listitem><para>The system is implemented as a C program which is 
     32 bits wide is implicit in hundreds of places in the
     system.</para></listitem>
   <listitem><para>The system is implemented as a C program which is 

@@ -160,8 +161,8 @@ debugging) do not work particularly well there. &SBCL; should be able
 to improve in these areas (and has already improved in some other
 areas), but it takes a while.</para>
 
 to improve in these areas (and has already improved in some other
 areas), but it takes a while.</para>
 

-<para>The &SBCL; GC, like the GC on the X86 port of &CMUCL;, is
-<emphasis>conservative</>. This means that it doesn't maintain a
+<para>On the x86, &SBCL; like the X86 port of &CMUCL;, uses a 
+<emphasis>conservative</> GC. This means that it doesn't maintain a

 strict separation between tagged and untagged data, instead treating
 some untagged data (e.g. raw floating point numbers) as
 possibly-tagged data and so not collecting any Lisp objects that they
 strict separation between tagged and untagged data, instead treating
 some untagged data (e.g. raw floating point numbers) as
 possibly-tagged data and so not collecting any Lisp objects that they

@@ -182,7 +183,7 @@ running system with new versions. This quasi-build procedure can cause
 various bizarre bootstrapping hangups, especially when a major change
 is made to the system. It also makes the connection between the
 current source code and the current executable more tenuous than in
 various bizarre bootstrapping hangups, especially when a major change
 is made to the system. It also makes the connection between the
 current source code and the current executable more tenuous than in

-any other software system I'm aware of -- it's easy to accidentally
+other software systems -- it's easy to accidentally

 <quote>build</> a &CMUCL; system containing characteristics not
 reflected in the current version of the source code.</para>
 
 <quote>build</> a &CMUCL; system containing characteristics not
 reflected in the current version of the source code.</para>