Re: DECstation 2100 floating point

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

> I tried turning off each option individually and still got 'inf'
> results. I then tried turning them all off, and still got an 'inf'
> result. The GCC man page says "only optimizations that have a flag are
> listed" so I guess it's one of the unlisted ones that's causing the
> problem.

I tried pkgsrc/benchmark/flops on NetBSD/cobalt 5.99.44 and
it shows a bit strange result:
---
# ./flops 

   FLOPS C Program (Double Precision), V2.0 18 Dec 1992

   Module     Error        RunTime      MFLOPS
                            (usec)
     1     -2.5193e+01      0.4895     28.5980
     2             nan     -0.0000  -4226415.0942
     3      1.4544e-14     33.3001      0.5105
     4      1.6415e+09     31.9524      0.4694
     5      1.8627e+17     69.2567      0.4187
     6     -1.1475e+87     40.3928      0.7179
     7      5.1090e+02     54.9010      0.2186
     8     -2.9167e-01      0.0000  33103448.4122

   Iterations      =    -640000
   NullTime (usec) =     0.0000
   MFLOPS(1)       =     1.5616
   MFLOPS(2)       =     0.3848
   MFLOPS(3)       =     0.6340
   MFLOPS(4)       =     0.8614

---

flops.c itself might have some non-C99-compliant statements
and aggressive gcc4 generates unintended code?

---
Izumi Tsutsui