md.texi (constraints): Mention that it is useless when the two alternatives are stric...

	* doc/md.texi (constraints) <% modifier>: Mention that it is
	useless when the two alternatives are strictly identical.

From-SVN: r90598

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 21d08056ee14ca15c4df5f51a4f165e7b4f5b2d6..3630a10d72018527bf6cf519591c17645b4d1645 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 adf9fe5d1951d86cb9d235f356cd5c3ecd234770..9d7771c27709a64b309d10d4a981f0eacfdd3d9f 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 #