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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 2)*

                                IHOP CORPORATION
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  COMMON STOCK
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   44962310
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

Check the following box if a fee is being paid with this | |  statement.  (A fee
is not required only if the filing person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                        (Continued on following page(s))

                                Page 1 of 5 Pages

SEC 1745 (10-85)



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CUSIP NO. 44962310                     13G             PAGE 2 OF 5 PAGES

- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Massachusetts Financial Services Company ("MFS")
     I.R.S. Identification No.:  04-2747644
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

     (a)   /   /           (b)     /   /
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
- --------------------------------------------------------------------------------
        NUMBER OF        5    SOLE VOTING POWER

            SHARES            505,800 shares of common stock

     BENEFICIALLY
- --------------------------------------------------------------------------------

         OWNED BY        6    SHARED VOTING POWER

             EACH
- --------------------------------------------------------------------------------

        REPORTING        7    SOLE DISPOSITIVE POWER

           PERSON             505,800 shares of common stock

             WITH
- --------------------------------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     505,800 shares of common stock which are also beneficially owned by MFS
     Series Trust II - MFS Emerging Growth Fund (see page 3).
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     5.2%
- --------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*
     IA
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!



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CUSIP NO.  44962310                    13G             PAGE 3 OF 5 PAGES

- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     MFS Series Trust II - MFS Emerging Growth Fund ("MEG")
     I.R.S. Identification No.:  04-6551722
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

     (a)   /   /           (b)     /   /
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    CITIZENSHIP OR PLACE OF ORGANIZATION

     Massachusetts
- --------------------------------------------------------------------------------
        NUMBER OF        5    SOLE VOTING POWER

            SHARES

     BENEFICIALLY
- --------------------------------------------------------------------------------

         OWNED BY        6    SHARED VOTING POWER

             EACH
- --------------------------------------------------------------------------------

        REPORTING        7    SOLE DISPOSITIVE POWER

           PERSON

             WITH
- --------------------------------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     505,800 shares of common stock (as noted on page 2, Item 9, MFS is also a
     beneficial owner of these shares).
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     5.2%
- --------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*
     IV
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!



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SCHEDULE 13G                                           PAGE 4 OF 5 PAGES

ITEM 1:   (a)   NAME OF ISSUER:

                IHOP Corporation

          (b)   ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                525 North Brand Blvd.
                Glendale, CA  91203-1903

ITEM 2:   (a)   NAME OF PERSON FILING:

                Massachusetts Financial Services Company ("MFS")*

          (b)   ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

                For MFS and MEG:
                500 Boylston Street
                Boston, MA  02116

          (c)   CITIZENSHIP:

                For MFS, see Item 4 on page 2; for MEG, see Item 4 on page 3

          (d)   TITLE OF CLASS OF SECURITIES:

                Common Stock

          (e)   CUSIP NUMBER:

                44962310

ITEM 3:         For MFS, see Item 12 on page 2; for MEG, see Item 12 on page 3

ITEM 4:   (a)   AMOUNT BENEFICIALLY OWNED:

                For MFS, see Item 9 on page 2; for MEG, see Item 9 on page 3

          (b)   PERCENT OF CLASS:

                For MFS, see Item 11 on page 2; for MEG, see Item 11 on page 3

          (c)   NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS VOTING AND
                DISPOSITIVE POWERS:

                For MFS, see Items 5 and 7 on page 2
- --------------------------
*    This Schedule 13G is also filed  pursuant to Rule 13d-1(f) on behalf of MFS
     Series Trust II - MFS Emerging  Growth Fund ("MEG") (see page 3 and Exhibit
     1 attached hereto).




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SCHEDULE 13G                                           PAGE 5 OF 5 PAGES

ITEM 5:         OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

                Inapplicable

ITEM 6:         OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                PERSON:

                Inapplicable

ITEM 7:         IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
                COMPANY:

                Inapplicable

ITEM 8:         IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

                Inapplicable

ITEM 9:         NOTICE OF DISSOLUTION OF GROUP:

                Inapplicable

ITEM 10:        CERTIFICATION:

                By signing  below I certify that to the best of my knowledge and
belief, the securities referred to above were acquired in the ordinary course of
business  and were not acquired for the purpose of and do not have the effect of
changing or  influencing  the control of the issuer of such  securities and were
not acquired in connection  with or as a participant in any  transaction  having
such purposes or effect.

                After  reasonable  inquiry and to the best of my  knowledge  and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.

Date:  February 12, 1998

Massachusetts Financial Services Company



By:            ARNOLD D. SCOTT
              Arnold D. Scott
      Senior Executive Vice President,
           Secretary and Director


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                                                                      EXHIBIT 1



                      MFS EMERGING GROWTH FUND, a series of
                               MFS SERIES TRUST II
               500 BOYLSTON STREET o BOSTON o MASSACHUSETTS 02116
                                 617 o 954-5000



                                            February 8, 1994



Massachusetts Financial Services Company
500 Boylston Street
Boston, MA  02116

         Re:      Rule 13d-1

Gentlemen:

         This letter is to  memorialize  our  agreement  that you shall file all
statements on Schedule 13G required to be filed on behalf of MFS Emerging Growth
Fund,  a series  of MFS  Series  Trust  II,  pursuant  to Rule  13d-1  under the
Securities  Exchange Act of 1934. If the foregoing is acceptable to you,  please
sign and return to us the enclosed copy of this letter.

                                            Very truly yours,

                                            W. THOMAS LONDON


                                            W. Thomas London
                                            Treasurer

The foregoing is acceptable.

MASSACHUSETTS FINANCIAL SERVICES COMPANY


By:      ARNOLD D. SCOTT
         Arnold D. Scott
         Senior Executive Vice President,
         Secretary and Director