🚀 go-pugleaf

I have discovered a bug in our C compiler (Pixel Computer Inc., Version 1.2,
3/9/84).  Since this bug caused a core dump in the net.sources game PHANTASIA
and many people have been CLUTTERING that group with complaints about a core
dump, I am guessing that this bug is more wide spread.  I believe our compiler
is of Unisoft derivation.

Attached is a short program to determine if you suffer from the bug.

The bug is:  fcmp(), the compiler's floating point comparison routine, destroys
regiser d0.  This is only a problem if a floating comparison is used as PART of
an expression: previously computed sub-expressions are trashed. 
[in PHANTASIA, the routine printloc() uses such an expression as an array 
subscipt, which caused a core dump].

The fix (if you can't fix the compiler):  given an expressions like:

    ...+(x>1.0)+...

where x is a floating point variable, replace it with:

    tmpint = (x>1.0); ...+ tmpint + ...

===================== cut here =====================
#include <stdio.h>

main()
{
    double x = 1.0, y = 1.0;
    int i;

    i = (x > 0) + 2*(y>0);
    printf ("%d\n", i);
    if (i != 3)
	printf("your compiler has problems.\n");
}