Ping!
On Tue, 2016-05-31 at 19:47 +0000, Pitchumani Sivanupandi wrote:
> Hi,
>
> avr-gcc was crashing for below test case.
> command line: avr-gcc -mmcu=atmega328p -O1 test.c
> <test.c>
> struct ResponseStruct{
> unsigned char responseLength;
> char *response;
> };
>
> static char response[5];
> struct ResponseStruct something(){
> struct ResponseStruct returnValue;
> returnValue.responseLength = 5;
> returnValue.response = response + 1;
> return returnValue;
> }
>
> Output:
> >
> > test.c:12:1: error: unrecognizable insn:
> > }
> > ^
> > (insn 6 5 7 2 (set (subreg:QI (reg:PSI 42 [ D.1499 ]) 1)
> > (subreg:QI (const:HI (plus:HI (symbol_ref:HI ("response")
> > [flags 0x2] <var_decl 0x7fda2ef3b900 response>)
> > (const_int -1 [0xffffffffffffffff
> > ]))) 0)) test.c:11 -1
> > (nil))
> > test.c:12:1: internal compiler error: in extract_insn, at
> > recog.c:2287
> > 0xd51195 _fatal_insn(char const*, rtx_def const*, char const*, int,
> > char const*)
> > /home/rudran/code/gcc/gcc/rtl-error.c:108
> Source operand is a subreg which has const operand as first operand.
> Subreg shall have pseudo, mem or hard registers as fist operand.
> Ref: https://gcc.gnu.org/onlinedocs/gccint/Regs-and-Memory.html
>
> For the reported case it has const expression. Isn't that incorrect?
> validate_subreg doesn't seem to reject this case. How can we avoid
> such
> case (avr target)?
>
> Regards,
> Pitchumani
