Re: [Valgrind-users] valgrind breaks any long double operation on x86-64

[Alex B. <ker...@be...>]

Irek Szczesniak <isz...@gm...> writes:

> On Thu, Jan 23, 2014 at 11:12 AM, Dallman, John
> <joh...@si...> wrote:
>>> Do any common platforms, other than x86/x86_64, offer more-than-64-bit "long double"?
>>
>> Not that they support as full speed hardware operations, AFAIK. SPARC has defined
>> registers and instructions for 128-bit floating point, but implements them as
>> sequences of operations on 64-bit floats, so they aren't terribly fast.
>
<snip>
> 3. Some SPARC emulators like Transitive implement full SPARCV9 128bit
> floating point instruction support, i.e. using the SPARCV9
> instructions directly results in faster execution than going through
> the libc wrappers and have them executed by Transitive
<snip>

FWIW the Transitive DBT also had to disable the generation of x87 code
by the compiler as it could seriously screw up NaN propagation when
interpreting SPARC floating point instructions. 

-- 
Alex Bennée