A few notes on choosing between Go and D for a quick project

weaselcat via Digitalmars-d digitalmars-d at puremagic.com
Sat Mar 21 21:21:05 PDT 2015

On Sunday, 22 March 2015 at 03:43:33 UTC, Walter Bright wrote:
> On 3/21/2015 2:08 PM, "Ola Fosheim =?UTF-8?B?R3LDuHN0YWQi?= 
> <ola.fosheim.grostad+dlang at gmail.com>" wrote:
>> On Saturday, 21 March 2015 at 19:35:02 UTC, Walter Bright 
>> wrote:
>>> I know I shouldn't, but I'll bite. Show me the "low level C 
>>> code" that
>>> effectively uses SIMD vector registers.
>> You are right, you should not bite. C code is superflous, this 
>> is a general
>> issue with efficient parallel computations. You want to avoid 
>> dependencies
>> within a single register.
>> E.g. Take a recurrence relation and make an efficient simd 
>> implementation for
>> it.  You might need to try to expand the terms so you have N 
>> independent
>> formulas. If it uses floating point you will have to be 
>> careful about drift
>> between the N formulas that are computed in parallel.
> I.e. there isn't low level C code that effectively uses SIMD 
> vector registers. You have to use the auto-vectorizer, which 
> tries to reconstruct high level operations out of C low level 
> code, then recompile.

at least it still compiles into efficient code for the PDP11?

More information about the Digitalmars-d mailing list