- /* (neg (plus X 1)) can become (not X). */
- if (GET_CODE (XEXP (x, 0)) == PLUS
- && XEXP (XEXP (x, 0), 1) == const1_rtx)
- return gen_rtx_NOT (mode, XEXP (XEXP (x, 0), 0));
-
- /* Similarly, (neg (not X)) is (plus X 1). */
- if (GET_CODE (XEXP (x, 0)) == NOT)
- return plus_constant (XEXP (XEXP (x, 0), 0), 1);
-
- /* (neg (minus X Y)) can become (minus Y X). This transformation
- isn't safe for modes with signed zeros, since if X and Y are
- both +0, (minus Y X) is the same as (minus X Y). If the rounding
- mode is towards +infinity (or -infinity) then the two expressions
- will be rounded differently. */
- if (GET_CODE (XEXP (x, 0)) == MINUS
- && !HONOR_SIGNED_ZEROS (mode)
- && !HONOR_SIGN_DEPENDENT_ROUNDING (mode))
- return gen_binary (MINUS, mode, XEXP (XEXP (x, 0), 1),
- XEXP (XEXP (x, 0), 0));
-
- /* (neg (plus A B)) is canonicalized to (minus (neg A) B). */
- if (GET_CODE (XEXP (x, 0)) == PLUS
- && !HONOR_SIGNED_ZEROS (mode)
- && !HONOR_SIGN_DEPENDENT_ROUNDING (mode))
- {
- temp = simplify_gen_unary (NEG, mode, XEXP (XEXP (x, 0), 0), mode);
- temp = combine_simplify_rtx (temp, mode, last, in_dest);
- return gen_binary (MINUS, mode, temp, XEXP (XEXP (x, 0), 1));
- }
-
- /* (neg (mult A B)) becomes (mult (neg A) B).
- This works even for floating-point values. */
- if (GET_CODE (XEXP (x, 0)) == MULT)
- {
- temp = simplify_gen_unary (NEG, mode, XEXP (XEXP (x, 0), 0), mode);
- return gen_binary (MULT, mode, temp, XEXP (XEXP (x, 0), 1));
- }
-