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Dark Schneider

D3DXQuaternionNormalize() and D3DXQuaternionLength()

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My question is if D3DXQuaternionNormalize() checks if quaternion is normalized or always do the operations. So, should I do?: D3DXQuaternionNormalize(&quat,&quat); or?: if(D3DXQuaternionLength(&quat)!=1) D3DXQuaternionNormalize(&quat,&quat); How FAST is D3DXQuaternionLength()?.

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