From: jgreenhalgh <jgreenhalgh@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 19 Sep 2014 16:23:44 +0000 (+0000)
Subject: Re: [Patch] Teach genrecog/genoutput that scratch registers require write constraint... 
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0993e1868d096cfb421644ba7c53e3eed29bf779;p=thirdparty%2Fgcc.git

Re: [Patch] Teach genrecog/genoutput that scratch registers require write constraint modifiers

gcc/

	* genrecog.c (validate_pattern): Allow empty constraints in
	a match_scratch.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@215397 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7ec7836f10cc..3e8ecc8a3a29 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-19  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* genrecog.c (validate_pattern): Allow empty constraints in
+	a match_scratch.
+
 2014-09-19  Aldy Hernandez  <aldyh@redhat.com>
 
 	* dwarf2out.c (decl_ultimate_origin): Update comment.
diff --git a/gcc/genrecog.c b/gcc/genrecog.c
index b3b5bb46addc..4d7d3b781bfd 100644
--- a/gcc/genrecog.c
+++ b/gcc/genrecog.c
@@ -461,6 +461,7 @@ validate_pattern (rtx pattern, rtx insn, rtx set, int set_code)
 	/* If a MATCH_SCRATCH is used in a context requiring an write-only
 	   or read/write register, validate that.  */
 	if (set_code == '='
+	    && constraints0
 	    && constraints0 != '='
 	    && constraints0 != '+')
 	  {