On Tue, Feb 21, 2012 at 12:12:32AM -0800, Thomas D. Dean wrote:
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
I saw your initial message, and yes, I noted that you are
using an x86_64 class cpu.
And, I also said the __float128 is likely to leave me with some code
that is orphaned.
As long as you use gcc 4.something or higher, you should have
access to __float128. So, code won't be orphaned. Now, if
you meant nonportable code, I agree. If you need more precision
that C99's long double and portability, then use mpfr.
--
Steve
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