Libm core dump with SIGILL

[Greg Stark <stark%mit.edu@localhost>]

While running the Postgres regression tests I found that the exp()
function in libm gets a SIGILL with certain arguments.

simh$  gcc -Wall  exp.c -lm
simh$ ./a.out
[4]   Illegal instruction (core dumped) ./a.out

On a modern architecture with IEEE floats:

$ gcc -Wall  exp.c -lm
$ ./a.out
exp(88.0297) = 1.70141e+38

I know the VAX floating points are not exactly IEEE and they may not
be able to represent this value but I would expect them to get a FPE
or signal overflow in some other way, not get a SIGILL?

The test program is this (also attached)

#include <math.h>
#include <stdio.h>

int main(int argc, char *argv[], char *envp[]) {
double arg = 88.029691931113055;
double ret = exp(arg);
printf("exp(%g) = %g\n", arg, ret);
return(0);
}


-- 
greg

#include <math.h>
#include <stdio.h>

int main(int argc, char *argv[], char *envp[]) {
	double arg = 88.029691931113055;
	double ret = exp(arg);
	printf("exp(%g) = %g\n", arg, ret);
	return(0);
}