re PR target/64160 (msp430 code generation error adding 32-bit integers)

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

From-SVN: r219058

gcc/ChangeLog

+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

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]);
    "
   )