* dojump.c (do_jump): Copy SUBREGs into a pseudo for comparison.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@65060 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 9 insertions, 4 deletions

diff --git a/gcc/dojump.c b/gcc/dojump.c
index 14fed968f32..6921d2b72be 100644
--- a/gcc/dojump.c
+++ b/gcc/dojump.c
@@ -588,10 +588,15 @@ do_jump (exp, if_false_label, if_true_label)
         /* Note swapping the labels gives us not-equal.  */
         do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label);
       else if (GET_MODE (temp) != VOIDmode)
-        do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
-                                 NE, TREE_UNSIGNED (TREE_TYPE (exp)),
-                                 GET_MODE (temp), NULL_RTX,
-                                 if_false_label, if_true_label);
+	{
+	  /* The RTL optimizers prefer comparisons against pseudos.  */
+	  if (GET_CODE (temp) == SUBREG)
+	    temp = copy_to_reg (temp);
+	  do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
+				   NE, TREE_UNSIGNED (TREE_TYPE (exp)),
+				   GET_MODE (temp), NULL_RTX,
+				   if_false_label, if_true_label);
+	}
       else
         abort ();
     }