Problem in supporting char addition

[Prashant Purohit]

Hi,
  I am trying to port gcc-4.3.0 to a custom architecture. The high level
language selected is C.
The processor is a RISC processor and all the registers are of 32-bits wide.
The integer data type (SImode) is set as 32-bits.

I have already completed implementation to support integer data type and it
works fine. Now I am trying to support other data types such as char
(8-bits), short int (16-bits).
I have defined the following things:
1. macros in the .h file:
#define LOAD_EXTEND_OP(MODE) SIGN_EXTEND

#define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
  if (GET_MODE_CLASS (MODE) == MODE_INT         \
      && GET_MODE_SIZE (MODE) < 4)              \
    {                                           \
      (MODE) = SImode;                          \
    }

#define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE)    \
  if ((GET_MODE_CLASS (MODE) == MODE_INT                \
       || GET_MODE_CLASS (MODE) == MODE_COMPLEX_INT)    \
      && GET_MODE_SIZE (MODE) < 4)                      \
    (MODE) = SImode;          

2. md patterns for zero_extend and extend patterns, movqi, addsi and movhi.

    With the above mentioned things, assignment of works for all datatype
combinations like
    char var = immediate value
    char var = char var
    int = char
    short int = char etc

    But for addition, like, 

     char = char + immediate

     We get the following error :
      
test.c: In function ‘main’:
test.c:36: error: unrecognizable insn:
(insn 10 9 11 3 test.c:26 (set (reg:SI 24 [ D.1181 ])
        (zero_extend:SI (subreg:SI (reg:QI 28) 0))) -1 (expr_list:REG_EQUAL
(zero_extend:SI (mem/c/i:QI (plus:SI (reg/f:SI 20 virtual-stack-vars)

                    (const_int -16 [0xfffffff0])) [0 a+0 S1 A32]))
        (nil)))
test.c:36: internal compiler error: in extract_insn, at recog.c:1992 
     
-- 
View this message in context: http://old.nabble.com/Problem-in-supporting-char-addition-tp27370844p27370844.html
Sent from the gcc - Help mailing list archive at Nabble.com.