Hi Erik,

yes, it's a FP stack overflow... :-)

I also tried with 9front, and the error message is slightly different:

./arithchk

#define IEEE_8087

#define Arith_Kind_ASL 1

arithchk 8523: suicide: sys: fp: invalid operation fppc=0x12ee status=0xb8b3 pc=0x000012f2

further checks reveal that the problem is this function:

void

get_nanbits(unsigned int *b, int k)

{

union { double d; unsigned int z[2]; } u, u1, u2;

k = 2 - k;

u1.z[k] = u2.z[k] = 0x7ff00000;

u1.z[1-k] = u2.z[1-k] = 0;

u.d = u1.d - u2.d; /* Infinity - Infinity */ <<<<<<<====== this is the FATAL ERROR.

b[0] = u.z[0];

b[1] = u.z[1];

}

called as getnanbits(nanbits,1)

I'm sorry but I don't know how to generate the acid code.

regards,

Fausto

2013/11/22 erik quanstrom <quanstro@quanstro.net>

> By the way I have always the same problem (suicide with stack overflow
> running arithchk).

that's not a stack overflow, that's a x87 floating point stack overflow.
if you would post the code around the program counter in your error
message it would be helpful. asm(*PC) with acid would be even better.

- erik