From: Hans-Peter Nilsson <hp@axis.com>
Date: Thu, 30 May 2002 00:50:06 +0000 (+0000)
Subject: md.texi (Patterns): Note pattern condition pitfall for unnamed insn.
X-Git-Tag: releases/gcc-3.1.1~231
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7a54d982ae08157752cc038a0198ca4dfdf0d373;p=thirdparty%2Fgcc.git

md.texi (Patterns): Note pattern condition pitfall for unnamed insn.

	* doc/md.texi (Patterns): Note pattern condition pitfall
	for unnamed insn.

From-SVN: r54033
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 23f78c697015..0b22dbae3766 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2002-05-29  Hans-Peter Nilsson  <hp@axis.com>
+
+	* doc/md.texi (Patterns): Note pattern condition pitfall
+	for unnamed insn.
+
 2002-05-29  Jason Thorpe  <thorpej@wasabisystems.com>
 
 	* config/sparc/netbsd-elf.c (CPP_SUBTARGET_SPEC64): Remove
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index c5bfd627fa5f..652198df4eb8 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -158,7 +158,9 @@ available in a particular run.
 For nameless patterns, the condition is applied only when matching an
 individual insn, and only after the insn has matched the pattern's
 recognition template.  The insn's operands may be found in the vector
-@code{operands}.
+@code{operands}.  For an insn where the condition has once matched, it
+can't be used to control register allocation, for example by excluding
+certain hard registers or hard register combinations.
 
 @item
 The @dfn{output template}: a string that says how to output matching