SIMD benchmark

[Manu]

On 16 January 2012 18:17, Andrei Alexandrescu <SeeWebsiteForEmail at erdani.org
> wrote:

> On 1/15/12 12:56 AM, Walter Bright wrote:
>
>> I get a 2 to 2.5 speedup with the vector instructions on 64 bit Linux.
>> Anyhow, it's good enough now to play around with. Consider it alpha
>> quality. Expect bugs - but make bug reports, as there's a serious lack
>> of source code to test it with.
>> -----------------------
>> import core.simd;
>>
>> void test1a(float[4] a) { }
>>
>> void test1()
>> {
>> float[4] a = 1.2;
>> a[] = a[] * 3 + 7;
>> test1a(a);
>> }
>>
>> void test2a(float4 a) { }
>>
>> void test2()
>> {
>> float4 a = 1.2;
>> a = a * 3 + 7;
>> test2a(a);
>> }
>>
>
> These two functions should have the same speed.


A function using float arrays and a function using hardware vectors should
certainly not be the same speed.
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