Re: [boost] Accelerating algorithms with SIMD - Segmented iterators and alternatives

Subject: Re: [boost] Accelerating algorithms with SIMD - Segmented iterators and alternatives
From: DE (satan66613_at_[hidden])
Date: 2010-10-12 14:11:59

on 12.10.2010 at 21:31
 Thomas Klimpel wrote :
> DE wrote:
>> so my question is: do you expect code writers which want their
>> binaries work across all modern x86 processors (starting with pentium)
>> to write plain version along with accelerated one? or will your
>> implementation fall back to plain old say x87 when sse2 is not
>> available so the writer could write only one version of source?

> But how is this different from specifying appropriate compile
> options for the platforms you intent to support? Even the code
> generated by a compiler will only work on the processor
> architectures that the compiler targeted. And if you tell the
> compiler to target the lowest common denominator, the resulting code will be quite slow.

for example intel compiler for win32 allows to generate two versions
binaries from one source: plain x86 and say sse2 which are switched at
runtime depending on cpuid

so the question still stands

-- 
Pavel
P.S.
if you notice a grammar mistake or weird phrasing in my message
please point it out