re PR tree-optimization/86010 (redundant memset with smaller size not eliminated)

	PR tree-optimization/86010
	* tree-ssa-dse.c (compute_trims): Fix typo/thinko.

From-SVN: r262841

gcc/ChangeLog

 2018-07-17  Jeff Law  <law@redhat.com>
 
+	PR tree-optimization/86010
+	* tree-ssa-dse.c (compute_trims): Fix typo/thinko.
+
 	* config/mips/mips.c (vr4130_align_insns): Update for recent
 	changes to label_to_alignment.
 

gcc/tree-ssa-dse.c

@@ -260,7 +260,7 @@ compute_trims (ao_ref *ref, sbitmap live, int *trim_head, int *trim_tail,
   /* If more than a word remains, then make sure to keep the
      starting point at least word aligned.  */
   if (last_live - first_live > UNITS_PER_WORD)
-    *trim_head &= (UNITS_PER_WORD - 1);
+    *trim_head &= ~(UNITS_PER_WORD - 1);
 
   if ((*trim_head || *trim_tail)
       && dump_file && (dump_flags & TDF_DETAILS))