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From: trq@moose.cita.utoronto.ca (Tom Quinn)
Newsgroups: gnu.gcc.bug
Subject: bug in gcc 1.30 for Sun FPA
Message-ID: <8810181407.AA06061@moose.cita.utoronto.ca>
Date: 18 Oct 88 14:07:24 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 70

The following code will cause gcc to get a fatal error if compiled
with "-O -mfpa" options.  This gcc version 1.30 on a Sun3/160 running
SunOS 4.0.

Tom Quinn                 Canadian Institute for Theoretical Astrophysics
trq@moose.cita.utoronto.ca
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The compile:
gcc -g -v -O -mfpa  -sun3 -c  nsat2.c
gcc version 1.30
 /usr/local/lib/gcc-cpp -v -undef -D__GNU__ -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__OPTIMIZE__ -D__HAVE_FPA__ -D__HAVE_68881__ -Dmc68020 nsat2.c /tmp/cca06058.cpp
GNU CPP version 1.30
 /usr/local/lib/gcc-cc1 /tmp/cca06058.cpp -quiet -dumpbase nsat2.c -mfpa -g -O -version -o /tmp/cca06058.s
GNU C version 1.30 (68k, MIT syntax) compiled by GNU C version 1.30.
gcc: Program cc1 got fatal signal 6.

The code:
------------------------------------------------------------------------
extern double drem();
struct sat {
    double a;			 
    double e;			 
    double pomega;
    double mu;			 
    double omega;		 
    double phi;
    double p0;			 
    double yr, yi;		 
    int n;			 
    int index;			 
    int current;		 
};
static double dt;
struct sat *nextpl(pl, nplanet, test)
struct sat *pl;
int nplanet;
struct sat test;
{
    struct sat *sptr, *encptr;
    double dtmin, dttry;
    double dphi;
    dtmin = 1.0 / 1.0e-12 ;
    encptr = 0 ;
    for(sptr = pl; sptr < pl + nplanet; sptr++) {
	if(sptr->current == 0) {  
	    if(test.a > sptr->a) {
		dphi = test.phi - sptr->phi;
	    } else {
		dphi = sptr->phi - test.phi;
	    }
	    dphi = drem(dphi, (2.0*3.14159265358979323846 ) );
	    if(dphi < 0.0) dphi = (2.0*3.14159265358979323846 )  + dphi;
	    if((dttry = dphi/({ double __value, __arg = (sptr->omega - test.omega); asm ("fpabsd %1, %0": "=xy" (__value): "xym" (__arg)); __value; }) ) < dtmin) {
		dtmin = dttry;
		encptr = sptr;
	    }
	}
    }
    for(sptr = pl; sptr < pl + nplanet; sptr++) {
	dphi = (2.0*3.14159265358979323846 ) ;
	if((dttry = dphi/({ double __value, __arg = (sptr->omega - test.omega); asm ("fpabsd %1, %0": "=xy" (__value): "xym" (__arg)); __value; }) ) < dtmin) {
	    dtmin = dttry;
	    encptr = sptr;
	}
    }
    dt = dtmin;
    return (encptr);
}