tree-ssa-loop-im.c (sort_bbs_in_loop_postorder_cmp): Stabilize sort.

	* tree-ssa-loop-im.c (sort_bbs_in_loop_postorder_cmp): Stabilize sort.
	* ira-color (allocno_hard_regs_compare): Likewise.

From-SVN: r256682

gcc/ChangeLog

+2018-01-14  Cory Fields  <cory-nospam-@coryfields.com>
+
+	* tree-ssa-loop-im.c (sort_bbs_in_loop_postorder_cmp): Stabilize sort.
+	* ira-color (allocno_hard_regs_compare): Likewise.
+
 2018-01-14  Nathan Rossi  <nathan@nathanrossi.com>
 
         PR target/83013

gcc/ira-color.c

@@ -300,8 +300,7 @@ allocno_hard_regs_compare (const void *v1p, const void *v2p)
     return 1;
   else if (hv2->cost < hv1->cost)
     return -1;
-  else
-    return 0;
+  return SORTGT (allocno_hard_regs_hasher::hash(hv2), allocno_hard_regs_hasher::hash(hv1));
 }
 
 

gcc/tree-ssa-loop-im.c

@@ -1496,7 +1496,7 @@ sort_bbs_in_loop_postorder_cmp (const void *bb1_, const void *bb2_)
   struct loop *loop1 = bb1->loop_father;
   struct loop *loop2 = bb2->loop_father;
   if (loop1->num == loop2->num)
-    return 0;
+    return bb1->index - bb2->index;
   return bb_loop_postorder[loop1->num] < bb_loop_postorder[loop2->num] ? -1 : 1;
 }