+ /* (eq/ne (xor x y) 0) simplifies to (eq/ne x y). */
+ if ((code == EQ || code == NE)
+ && op1 == const0_rtx
+ && op0code == XOR)
+ return simplify_gen_relational (code, mode, cmp_mode,
+ XEXP (op0, 0), XEXP (op0, 1));
+
+ /* (eq/ne (xor x y) x) simplifies to (eq/ne y 0). */
+ if ((code == EQ || code == NE)
+ && op0code == XOR
+ && rtx_equal_p (XEXP (op0, 0), op1)
+ && !side_effects_p (XEXP (op0, 0)))
+ return simplify_gen_relational (code, mode, cmp_mode,
+ XEXP (op0, 1), const0_rtx);
+
+ /* Likewise (eq/ne (xor x y) y) simplifies to (eq/ne x 0). */
+ if ((code == EQ || code == NE)
+ && op0code == XOR
+ && rtx_equal_p (XEXP (op0, 1), op1)
+ && !side_effects_p (XEXP (op0, 1)))
+ return simplify_gen_relational (code, mode, cmp_mode,
+ XEXP (op0, 0), const0_rtx);
+
+ /* (eq/ne (xor x C1) C2) simplifies to (eq/ne x (C1^C2)). */
+ if ((code == EQ || code == NE)
+ && op0code == XOR
+ && (GET_CODE (op1) == CONST_INT
+ || GET_CODE (op1) == CONST_DOUBLE)
+ && (GET_CODE (XEXP (op0, 1)) == CONST_INT
+ || GET_CODE (XEXP (op0, 1)) == CONST_DOUBLE))
+ return simplify_gen_relational (code, mode, cmp_mode, XEXP (op0, 0),
+ simplify_gen_binary (XOR, cmp_mode,
+ XEXP (op0, 1), op1));
+
+ if (op0code == POPCOUNT && op1 == const0_rtx)
+ switch (code)
+ {
+ case EQ:
+ case LE:
+ case LEU:
+ /* (eq (popcount x) (const_int 0)) -> (eq x (const_int 0)). */
+ return simplify_gen_relational (EQ, mode, GET_MODE (XEXP (op0, 0)),
+ XEXP (op0, 0), const0_rtx);
+
+ case NE:
+ case GT:
+ case GTU:
+ /* (ne (popcount x) (const_int 0)) -> (ne x (const_int 0)). */
+ return simplify_gen_relational (NE, mode, GET_MODE (XEXP (op0, 0)),
+ XEXP (op0, 0), const0_rtx);
+
+ default:
+ break;
+ }
+