2012/9/11 Sisyphus <[email protected]>
> the output I get is:
>
> 1..1
> # a = [ 0 1 2 2 4 5 5 6 8 9 10 ]
> # b = [ 0 1 2 2 4 4 5 6 8 8 9 ]
> # a - b = [ 0 0 0 0 0 1 0 0 0 1 1 ]
> not ok 1 - lists are equal
>
> Is there a way to get the same output with the 64-bit mingw compiler ?
>
I feel compelled to say that if you are subtracting floats to check for
equality, you should be smacked in the face. This float-store kind of thing
can be different per compiler version, OS, and heck, even CPU if they
introduce some kind of low-level float optimization somewhere. You should
not be relying on float equality and the way a CPU actually uses its 80-bit
registers or not.
But .... if you know what you're doing, don't mind me :)
Ruben
> (I admit, this is a different question to the one that I originally asked.)
>
> With my 64-bit compilers, I've (now) tried different optimisations with
> both -fno-float-store and -ffloat-store, but I always seem to get output
> of:
>
> 1..1
> # a = [ 0 1 2 2 4 5 5 6 8 9 10 ]
> # b = [ 0 1 2 2 4 5 5 6 8 9 10 ]
> # a - b = [ 0 0 0 0 0 0 0 0 0 0 0 ]
> ok 1 - lists are equal
>
> >> And a second question:
> >> Is -fno-float-store a valid option ?
> > Yes, it is.
>
> Ok - thanks.
>
> > It is a valid option and documented by gcc's documentation. See for
> > more details either invoke.texi or 'gcc info'.
>
> How does one invoke either of these in mingw ? (Or msys.)
>
> For reference, the documentation that I looked at was
>
> http://gcc.gnu.org/onlinedocs/gcc-3.4.4/gcc/Option-Summary.html#Option-Summary
>
> http://gcc.gnu.org/onlinedocs/gcc-4.5.2/gcc/Option-Summary.html#Option-Summary
>
> http://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Option-Summary.html#Option-Summary
>
> Thanks Kai.
> I appreciate that you take the time to answer my dumb questions.
>
> Cheers,
> Rob
>
>
>
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