* doc/md.texi (constraints) <% modifier>: Mention that it is

	useless when the two alternatives are strictly identical.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90598 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 21d0805..3630a10 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2004-11-13  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
+       * doc/md.texi (constraints) <% modifier>: Mention that it is
+       useless when the two alternatives are strictly identical.
+
 2004-11-13  Richard Henderson  <rth@redhat.com>
 
        * expmed.c (extract_split_bit_field): Temporarily disable call to

diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index adf9fe5..9d7771c 100644 (file)
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -1550,7 +1550,9 @@ instruction is defined:
 @end smallexample
 @end ifset
 GCC can only handle one commutative pair in an asm; if you use more,
-the compiler may fail.
+the compiler may fail.  Note that you need not use the modifier if
+the two alternatives are strictly identical; this would only waste
+time in the reload pass.
 
 @cindex @samp{#} in constraint
 @item #