Hi all, just a question about the gcc compiler suite

[Fabio G. <fab...@au...>]

Hi all,
I have found the following problem.
I'm using gcc 3.2.3 hms for sh target; in particular I'm using the c compiler (gcc without g++) and Icompiled 3.2.3 - hms version without any patch.

On sh2 7145 and 7044 I had no problem; now I'm porting a software on sh2 7085 (7080 family;
http://eu.renesas.com/fmwk.jsp?cnt=sh7080_series_landing.jsp&fp=/products/mpumcu/superh_family/sh7080_series/)  and I discovered such a problem:
I have this struct describing the AD converter registers:
struct st_ad0 {                                         /* struct A/D0  */
              unsigned short    ADDR0;                  /* ADDR0        */
              unsigned short    ADDR1;                  /* ADDR1        */
              unsigned short    ADDR2;                  /* ADDR2        */
              unsigned short    ADDR3;                  /* ADDR3        */
              char              wk1[8];                 /*              */
              union {                                   /* ADCSR        */
                    unsigned short WORD;                /*  Word Access */
                    struct {                            /*  Bit  Access */
                           unsigned short ADF   :1;     /*    ADF       */
                           unsigned short ADIE  :1;     /*    ADIE      */
                           unsigned short       :2;     /*              */
                           unsigned short TRGE  :1;     /*    TRGE      */
                           unsigned short       :1;     /*              */
                           unsigned short CONADF:1;     /*    CONADF    */
                           unsigned short STC   :1;     /*    STC       */
                           unsigned short CKSL  :2;     /*    CKSL      */
                           unsigned short ADM   :2;     /*    ADM       */
                           unsigned short ADCS  :1;     /*    ADCS      */
                           unsigned short CH    :3;     /*    CH        */
                           }       BIT;                 /*              */
                    }           ADCSR;                  /*              */
              union {                                   /* ADCR         */
                    unsigned short WORD;                /*  Word Access */
                    struct {                            /*  Bit  Access */
                           unsigned short     :2;       /*              */
                           unsigned short ADST:1;       /*    ADST      */
                           }       BIT;                 /*              */
                    }           ADCR;                   /*              */
              char              wk2[8060];              /*              */
              union {                                   /* ADTSR        */
                    unsigned short WORD;                /*  Word Access */
                    struct {                            /*  Bit  Access */
                           unsigned short       :4;     /*              */
                           unsigned short TRG01S:4;     /*    TRG01S    */
                           unsigned short       :4;     /*              */
                           unsigned short TRG0S :4;     /*    TRG0S     */
                           }       BIT;                 /*              */
                    }           ADTSR;                  /*              */
};                                                      /*              */


Reading the hw manual you can see ADCSR is a register accessible only as word (16 bit) so the only assembler allowed istruction to access the register is MOV.W;
Obviusly if I write 
AD0.ADCSR.WORD |= BIT14 or AD0.ADCSR.WORD &= ~BIT14
what I read in assembler is correct;
if I write
AD0.ADCSR.BIT.ADIE = 1 or AD0.ADCSR.BIT.ADIE = 0
in assembler is used a MOV.B instruction being not allowed by the architecture.

Is this a complier bug? How could I approach the problem?
Obviusly I can avoid the bit field manupulation in the 16 bit access register but I'd like to have a full featured compiler.

Thanks

-- 
Fabio Giovagnini

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