Gcc46 and 128 Bit Floating Point

Thomas D. Dean tomdean at speakeasy.org
Tue Feb 21 08:12:32 UTC 2012


On 02/20/12 23:20, Steve Kargl wrote:

> float -------->  24 bit significand, 32 bit size.
> double ------->  53 bit significand, 64 bit size.
> long double -->  53 bit significand, 80 bit size, i386
> long double -->  64 bit significand, 80 bit size, x86_64
> long double -->  113 bit significand, 128 bit size, sparc64
> __float128 --->  113 bit significand, 128 bit size, i386, x86_64
>

Nice, if you are not working on my platform.  In my initial message,

 From dmesg:
CPU: Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz (4160.12-MHz K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x206d6  Family = 6  Model = 2d 
Stepping = 6

And, I also said the __float128 is likely to leave me with some code 
that is orphaned.

Tom Dean


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