update THANKS

[bpt/guile.git] / NEWS

diff --git a/NEWS b/NEWS
index 3c65d98..6bebbf6 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,34 @@ instead.
 `define-once' is like Lisp's `defvar': it creates a toplevel binding,
 but only if one does not exist already.
 
+** Added four new sets of fast quotient and remainder operators
+
+Added four new sets of fast quotient and remainder operators with
+different semantics than the R5RS operators.  They support not only
+integers, but all reals, including exact rationals and inexact
+floating point numbers.
+
+These procedures accept two real numbers N and D, where the divisor D
+must be non-zero.  Each set of operators computes an integer quotient
+Q and a real remainder R such that N = Q*D + R and |R| < |D|.  They
+differ only in how N/D is rounded to produce Q.
+
+`floor-quotient' and `floor-remainder' compute Q and R, respectively,
+where Q has been rounded toward negative infinity.  `floor/' returns
+both Q and R, and is more efficient than computing each separately.
+Note that when applied to integers, `floor-remainder' is equivalent to
+the R5RS integer-only `modulo' operator.  `ceiling-quotient',
+`ceiling-remainder', and `ceiling/' are similar except that Q is
+rounded toward positive infinity.
+
+For `truncate-quotient', `truncate-remainder', and `truncate/', Q is
+rounded toward zero.  Note that when applied to integers,
+`truncate-quotient' and `truncate-remainder' are equivalent to the
+R5RS integer-only operators `quotient' and `remainder'.
+
+For `round-quotient', `round-remainder', and `round/', Q is rounded to
+the nearest integer, with ties going to the nearest even integer.
+
 ** Improved exactness handling for complex number parsing
 
 When parsing non-real complex numbers, exactness specifiers are now
@@ -581,12 +609,12 @@ newer than that of the .scm file; if the .scm or .go files are moved
 after installation, care should be taken to preserve their original
 timestamps.
 
-Autocompiled files will be stored in the $XDG_CACHE_HOME/guile/ccache
+Auto-compiled files will be stored in the $XDG_CACHE_HOME/guile/ccache
 directory, where $XDG_CACHE_HOME defaults to ~/.cache. This directory
 will be created if needed.
 
-To inhibit autocompilation, set the GUILE_AUTO_COMPILE environment
-variable to 0, or pass --no-autocompile on the Guile command line.
+To inhibit automatic compilation, set the GUILE_AUTO_COMPILE environment
+variable to 0, or pass --no-auto-compile on the Guile command line.
 
 ** New POSIX procedures: `getrlimit' and `setrlimit'