From: John Pavel (jrp_at_[hidden])
Date: 2007-12-01 17:43:40
On 1 Dec 2007, at 18:34, Vladimir Prus wrote:
> On Friday 16 November 2007 21:44:04 John Pavel wrote:
>> Just as it is possible to invoke, eg, async exceptions by means of
>> : requirements
>> it would be helpful to be able to set a few other flags, notably for
>> different types of special instruction and floating point handling:
>> More specifically, could we invoke the use of SSE instructions?
>> In gcc, this is done by the -mssse, -mssse2, etc, flags. gcc 4.3.0
>> . Support for SSSE3 built-in functions and code generation are
>> available via
>> -mssse3 (which also comes with the core2 architecture)
>> . Support for SSE4.1 built-in functions and code generation are
>> via -msse4.1.
>> . Support for SSE4.2 built-in functions and code generation are
>> via -msse4.2.
>> (see http://gcc.gnu.org/gcc-4.3/changes.html)
>> VC++ has the /arch option (see
>> Intel has
>> Could we also invoke different types of floating point handling:
>> For recent versions of VC++ (and Intel compilers) we have /fp:
>> [precise |
>> except[-] | fast | strict ] (see
>> Gcc has a similar, if more finely grained, set of options.
>> These options would be even more useful if combined with the
>> ability to time
>> the running of tests, as it would allow the user to test the impact
>> of using
>> faster v more accurate fp handling.
> I'm not sure. Are those options present in other compilers, in
> same form. It's probably not worth adding a feature if it's easy to
> accomplish using explicit options, and there are just two compilers
> of interest.
They are also available in the Intel compilers. They ought to be
properly integrated with the cpu/architecture options that are being
discussed in a parallel thread.
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