rtl.def (CONSTANT_P_RTX): New.

        * rtl.def (CONSTANT_P_RTX): New.
        * rtl.h (CONSTANT_P): Recognize it.
        * cse.c (fold_rtx): Eliminate it.
        * expr.c (can_handle_constant_p): New variable.
        (init_expr_once): Initialize it.
        (expand_builtin): Generate CONSTANT_P_RTX if the expression is not
        immediately recognizable as a constant.

From-SVN: r20846

1 files changed, 6 insertions, 0 deletions

diff --git a/gcc/cse.c b/gcc/cse.c
index 868b7de..bd2aa56 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -5715,6 +5715,12 @@ fold_rtx (x, insn)
 					const_arg1 ? const_arg1 : folded_arg1,
 					const_arg2 ? const_arg2 : XEXP (x, 2));
       break;
+
+    case 'x':
+      /* Always eliminate CONSTANT_P_RTX at this stage. */
+      if (code == CONSTANT_P_RTX)
+	return (const_arg0 ? const1_rtx : const0_rtx);
+      break;
     }
 
   return new ? new : x;