1.0.32.24: document stream external-formats and :replacement option

[sbcl.git] / doc / manual / efficiency.texinfo

diff --git a/doc/manual/efficiency.texinfo b/doc/manual/efficiency.texinfo
index b6d67fe..5c94214 100644 (file)
--- a/doc/manual/efficiency.texinfo
+++ b/doc/manual/efficiency.texinfo
@@ -4,10 +4,11 @@
 @cindex Efficiency
 
 @menu
-* Slot access::                 
-* Dynamic-extent allocation::   
-* Modular arithmetic::          
-* Miscellaneous Efficiency Issues::  
+* Slot access::
+* Dynamic-extent allocation::
+* Modular arithmetic::
+* Global and Always-Bound variables::
+* Miscellaneous Efficiency Issues::
 @end menu
 
 @node  Slot access
@@ -92,14 +93,14 @@ useful. At present, SBCL implements stack allocation for
 @code{&rest} lists, when these are declared @code{dynamic-extent}.
 
 @item
-@code{cons}, @code{list} and @code{list*}, when the result is bound to
-a variable declared @code{dynamic-extent}.
+@code{cons}, @code{list}, @code{list*}, and @code{vector} when the
+result is bound to a variable declared @code{dynamic-extent}.
 
 @item
 simple forms of @code{make-array}, whose result is bound to a variable
 declared @code{dynamic-extent}: stack allocation is possible only if
-the resulting array is one-dimensional, and the call has no keyword
-arguments with the exception of @code{:element-type}.
+the resulting array is known to be both simple and one-dimensional,
+and has a constant @code{:element-type}.
 
 @strong{Note}: stack space is limited, so allocation of a large vector
 may cause stack overflow. For this reason potentially large vectors,
@@ -223,6 +224,36 @@ argument. ``Good'' widths are 32 on HPPA, MIPS, PPC, Sparc and x86 and
 64 on Alpha.  While it is possible to support smaller widths as well,
 currently this is not implemented.
 
+@node  Global and Always-Bound variables
+@comment  node-name,  next,  previous,  up
+@section Global and Always-Bound variables
+
+@include macro-sb-ext-defglobal.texinfo
+
+@deftp {Declaration} sb-ext:global
+
+Syntax: @code{(sb-ext:global symbol*)}
+
+Only valid as a global proclamation.
+
+Specifies that the named symbols cannot be proclaimed or locally
+declared @code{special}. Proclaiming an already special or constant
+variable name as @code{global} signal an error. Allows more efficient
+value lookup in threaded environments in addition to expressing
+programmer intention.
+@end deftp
+
+@deftp {Declaration} sb-ext:always-bound
+
+Syntax: @code{(sb-ext:always-bound symbol*)}
+
+Only valid as a global proclamation.
+
+Specifies that the named symbols is always bound. Inhibits @code{makunbound}
+of the named symbols. Proclaiming an unbound symbol as @code{always-bound} signals
+an error. Allows compiler to elide boundness checks from value lookups.
+@end deftp
+
 @node  Miscellaneous Efficiency Issues
 @comment  node-name,  next,  previous,  up
 @section Miscellaneous Efficiency Issues