Re: int128_t
Re: int128_t
- Subject: Re: int128_t
- From: Paul Russell <email@hidden>
- Date: Fri, 17 Oct 2008 10:21:48 +0100
Just out of curiosity, why do you think you need more than 64 bits for
a financial application ?
For example, take a large amount of money, say the US national debt,
around 10 trillion dollars. Convert it to a currency with a high
exchange rate, e.g. Japanese Yen at around 100 yen to the dollar, and
just for the hell of it multiply by another 100 (to allow for
inflation over the next year ;-)). That's 10^17, which needs log(17) /
log(2) = 57 bits. Why do you think you need even more bits more than
this ?
Paul
On 16 Oct 2008, at 13:45, email@hidden wrote:
Maybe you were thinking of 128 bit long doubles ?
we already use the 128 long doubles, the thing is we do a lot of
accounting like
calculations and 'almost accurate' is not an option :-) i heard one
can even
be sent to jail for that in the USA
64 bit integers work great for that matter, but we like to step up
to more bits
the other tip i got was that we should look for
Sint128
but this type is unknow to gcc4.2 also
Paul
On 15 Oct 2008, at 13:02, email@hidden wrote:
hi,
i setup a configuration in my project that uses gcc4.2 instead of
gcc4.0
because i read that from gcc4.1 the compiler would support 128-bit
integer
types
however:
typedef int64_t pxlong;
// typedef int128_t pxlong;
compiles ok, while
// typedef int64_t pxlong;
typedef int128_t pxlong;
gives an error saying 'int128_t' is not a type
what am i doing wrong here?
any help is very much appreciated
---
perry
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