Is ISCP code running on AMD CPUs?

[Tomasz Koziara]

Hi

Now I am just curious: Will the code generated by ISCP run on AMD processors?

Best regards,

Tomek

[Dmitry Babokin]

Hi,

ISPC was never tuned to run specifically on AMD CPUs, but if the processor supports appropriate instructuction set (SSE4/AVX, etc), the code should run without any problems and has good performance.

Best regards,

Dmitry.

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[qmo...@gmail.com]

Hi, 

I also have the same question as Tomek, but I would like to know more detail if possible. 

For example, if the AMD CPU only support SSE2 or even no SSE, can I still run the code but it's slow or I totally cannot run the code?

And what do you mean by "good performance"? is it as good as Intel CPU or slower but faster than usual C code?

Best regards,

qmokid.

Dmitry Babokin於 2013年6月17日星期一UTC+8下午6時04分18秒寫道：

[Matt Pharr]

On x86 CPUs, ISPC requires at least SSE2 support.  However, both Intel's and AMD's CPUs have supported SSE2 for at least the last ten years; the two have generally adopted ISA extensions within a year or two of each other--recent AMD processors ship with AVX (but not yet AVX2, which the latest Intel ones support), for example.

More specifics here: http://en.wikipedia.org/wiki/Comparison_of_AMD_processors.

I haven't checked this, but my guess would be that if a given AMD processor is, for example, generally half as fast as some other Intel processor for general workloads, it would also be half as fast when running ISPC code vs the Intel processor.

Or, put more positively: if something has a 3x speedup with some version of SSE on Intel CPUs, I'd expect about a 3x speedup with the same version of SSE on an AMD CPU (both versus a serial baseline on the corresponding CPU).

Matt

[qmo...@gmail.com]

Hi Matt,

Thank you for your nice and clear response!

Best regards,

qmokid

Matt Pharr於 2013年7月31日星期三UTC+8下午9時10分17秒寫道：

[James Brodman]

Matt said it pretty well :)

That being said - if you find any problems with ISPC on AMD, file a bug report!

-James