Sun C bug [from info-gcc]

[Tom Perrine x426]

I noticed this in gnu.gcc.bug, and thought people would be interested.

    From: !mcgrath at tully.Berkeley.EDU (Roland McGrath)
    Newsgroups: gnu.gcc.bug
    Subject: gcc 1.35 fixunsdfsi doesn't work on Sun 3 (68020)
    Date: 14 May 89 11:49:54 GMT

    There is a bug in the Sun 3 C compiler such that under -O,
    the `__fixunsdfsi' function in gnulib gets done wrong.
    Without -O, it compiles to:

	    link a6, #0
	    movel a6@(8), d0
	    movel a6@(12), d1
	    jsr Fund
	    unlk a6
	    rts

    With -O, it becomes:

	    link a6, #0
	    jsr Fund
	    unlk a6
	    rts

    which doesn't work.

    The bottom line is that unless you compile gnulib without -O, casting a
    double to an unsigned int won't work (it will always come out zero).