From: nickc <nickc@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 24 Dec 2014 13:36:29 +0000 (+0000)
Subject: 	PR target/64160
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f36d41bf1895aadd0693e8d377c1a15e0f4d544f;p=thirdparty%2Fgcc.git

	PR target/64160
	* config/msp430/msp430.md (addsi splitter): Do not split when the
	destination partially overlaps the source.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@219058 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0d817d26994e..259e2af9f989 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2014-12-24  Nick Clifton  <nickc@redhat.com>
+
+	PR target/64160
+	* config/msp430/msp430.md (addsi splitter): Do not split when the
+	destination partially overlaps the source.
+
 2014-12-22  Zhouyi Zhou <yizhouzhou@ict.ac.cn>
 
 	* ira-build.c (ira_flattening): Add the current
diff --git a/gcc/config/msp430/msp430.md b/gcc/config/msp430/msp430.md
index 60e7b6ff1420..d9abeef545bc 100644
--- a/gcc/config/msp430/msp430.md
+++ b/gcc/config/msp430/msp430.md
@@ -402,14 +402,16 @@
    operands[6] = msp430_subreg (HImode, operands[0], SImode, 2);
    operands[7] = msp430_subreg (HImode, operands[1], SImode, 2);
    operands[8] = msp430_subreg (HImode, operands[2], SImode, 2);
+
+   /* BZ 64160: Do not use this splitter when the dest partially overlaps the source.  */
+   if (reg_overlap_mentioned_p (operands[3], operands[7])
+       || reg_overlap_mentioned_p (operands[3], operands[8]))
+      FAIL;
+
    if (GET_CODE (operands[5]) == CONST_INT)
-     {
-       operands[9] = GEN_INT (INTVAL (operands[5]) & 0xffff);
-     }
+     operands[9] = GEN_INT (INTVAL (operands[5]) & 0xffff);
    else
-     {
-       operands[9] = gen_rtx_ZERO_EXTEND (SImode, operands[5]);
-     }
+     operands[9] = gen_rtx_ZERO_EXTEND (SImode, operands[5]);
    "
   )