I have run a number of tests, not terribly scientifically
organised! Although I haven't found the point where pi starts to
fail, it is worth keeping you informed of developments.

Sorry for the long delay, each run takes a while!

Your test program:
size            state   error
1000000000      fail    Floating point overflow
640000000       pass
650000000       fail    Floating point overflow
646456992       fail    Floating point overflow
646456991       fail    Floating point overflow
646400000       pass
646450000       pass
646456900       fail    Floating point overflow
646456800       fail    Floating point overflow
646456000       pass
646456500       pass
646456700       fail    Floating point overflow
646456650       fail    Floating point overflow
646456610       pass
646456620       fail    Floating point overflow
646456630       fail    Floating point overflow
646456640       fail    Floating point overflow
646456610       pass
646456611       pass
646456612       pass
646456613       pass
646456614       pass
646456615       fail    Floating point overflow
646456616       fail    Floating point overflow
646456617       fail    Floating point overflow
646456618       fail    Floating point overflow
646456619       fail    Floating point overflow

So failure occurs at > 646456614

With pi, which takes much longer to run,

size            state   error
pi 646456614    fail    Internal error: statement in file
float/output/cl_F_dprint.cc, line 359 has been reached!!Please send the authors 
of the program a description how you produced this
error!pi 646456615      fail    Floating point overflow
pi 646456613    fail    Internal error: statement in file
float/output/cl_F_dprint.cc, line 359 has been reached!!Please send the authors 
of the program a description how you produced this
error!
So, it seems I have provoked another, separate problem.
But I can confirm that pi with values > 646456614 causes the floating
point overflow I originally reported.

I will keep looking for pi's failure value.

--
Steve




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