Introduce and use unknown_optab

Prep for a later patch where this becomes an enum value.

        * optabs.h (unknown_optab): New.
        * builtins.c (interclass_mathfn_icode): Use it.
        * dojump.c (do_compare_rtx_and_jump): Likewise.
        * optabs.c (optab_for_tree_code, expand_binop): Likewise.
        * tree-vect-generic.c (add_rshift, expand_vector_divmod): Likewise.
        (expand_vector_operations_1): Likewise.
        * tree-vect-patterns.c (vect_recog_divmod_pattern): Likewise.
        * tree-vect-stmts.c (supportable_narrowing_operation): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@189816 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 8 deletions

diff --git a/gcc/dojump.c b/gcc/dojump.c
index 06b8d04437a..24eed63e491 100644
--- a/gcc/dojump.c
+++ b/gcc/dojump.c
@@ -1028,19 +1028,16 @@ do_compare_rtx_and_jump (rtx op0, rtx op1, enum rtx_code code, int unsignedp,
 	  op0 = op1;
 	  op1 = tmp;
 	}
-
       else if (SCALAR_FLOAT_MODE_P (mode)
 	       && ! can_compare_p (code, mode, ccp_jump)
-
-	       /* Never split ORDERED and UNORDERED.  These must be implemented.  */
+	       /* Never split ORDERED and UNORDERED.
+		  These must be implemented.  */
 	       && (code != ORDERED && code != UNORDERED)
-
-               /* Split a floating-point comparison if we can jump on other
-	          conditions...  */
+               /* Split a floating-point comparison if
+		  we can jump on other conditions...  */
 	       && (have_insn_for (COMPARE, mode)
-
 	           /* ... or if there is no libcall for it.  */
-	           || code_to_optab[code] == NULL))
+	           || code_to_optab[code] == unknown_optab))
         {
 	  enum rtx_code first_code;
 	  bool and_them = split_comparison (code, mode, &first_code, &code);