Re: [Bug middle-end/25882] libgcov.c:577: ICE: Segmentation fault

[Prashant Purohit]

Hi all,

I am getting the similar error while building the GCC tool chain.

I am unable to get what the line "This appears fixed by r110130." mean?

How to get where the fix for the above bug is?

Any help in this regard will be appreciated.

Best Regards,
Prashant S. Purohit.


Bugzilla from gcc-bugzi...@gcc.gnu.org wrote:
> 
> 
> 
> --- Comment #2 from danglin at gcc dot gnu dot org  2006-01-20 18:19
> ---
> This appears fixed by r110130.
> 
> 
> -- 
> 
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25882
> 
> 
> 

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Problem supporting char and short int

[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 and movhi.

The gcc builds successfully and also cc1 compiles the following C code. But
you can see that the generated assembly has bugs.

C code:
   void main()
{
   short int c;
   int b;

   b = c;

}

generated .s looks something like :

...function prologue..
loadHI Reg1, (frame_pointer, #-18)
storeHI Reg1,[frame_pointer, #-28] 
loadSI  Reg2, [frame_pointer, #-28]
ashiftleft   Reg1,Reg2,#16
ashiftright Reg1,Reg1,#16
storeSI Reg1,[frame_pointer, #-16]
...function epilogue


expected .s is:
...function prologue..
loadHI Reg1, (frame_pointer, #-18)
storeSI Reg1,[frame_pointer, #-16]
...function epilogue

I am not able to find out why extra load, store and shift instructions are
generated.

- Prashant.
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