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Re: optimizing sin() on Intel and PowerPC
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Re: optimizing sin() on Intel and PowerPC


On Sep 5, 2006, at 11:59 AM, Artemiy Pavlov wrote:

Hello Ian,

and thanks a lot for the reply.

Yes, it is a normal function. You don't even need to turn on vector extensions in the compiler if you don't want to. 

Ian, I tried this test code to obtain a single sine:

	float SineInput[1], SineOutput[1];

	SineInput[0] = M_PI;

	vvsinf( SineOutput, SineInput, 1);

But I get:

Waveforms.h:22: error: invalid conversion from 'int' to 'const int*'
Waveforms.h:22: error: initializing argument 3 of 'void vvsinf (float*, const float*, const int*)'

Could you possibly suggest what I am doing wrong with the third parameter?

void vvsinf (float * /* y */, const float * /* x */, const int * /* n */) AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;

	float SineInput[1], SineOutput[1];
	int length = 1;
	vvsinf( SineOutput, SineInput, &length );

It will not be fast in this particular usage. The speed doesn't really come in until length is at least four, and much better when it is at least 16 and the data is 16 byte aligned.

Ian


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References: 


 >optimizing sin() on Intel and PowerPC (From: Artemiy Pavlov <email@hidden>)


 >Re: optimizing sin() on Intel and PowerPC (From: Ian Ollmann <email@hidden>)


 >Re: optimizing sin() on Intel and PowerPC (From: Artemiy Pavlov <email@hidden>)


 >Re: optimizing sin() on Intel and PowerPC (From: Ian Ollmann <email@hidden>)


 >Re: optimizing sin() on Intel and PowerPC (From: Artemiy Pavlov <email@hidden>)























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