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

[Christian B. <bor...@de...>]

On 23/01/14 11:12, Dallman, John 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.
> 
> IBM System/390 onwards supports 128-bit float in hardware, according to Wikipedia.

Yes, s390 does use 128 bit float for long-double (if -mlong-double-128 is used, which is
the default for a while). The valgrind port of s390x supports that, but I think that
the valgrind test coverage for 128 bit float is not that good.


Christian