/*
* Scale FFT data by 1/|length|. |length| must be a power of two
*/
static inline ScaleRFFTData(OMX_F32* fftData, unsigned length) {
float32_t* data = (float32_t*)fftData;
float32_t scale = 2.0f / length;
if (length >= 4) {
/*
* Do 4 float elements at a time because |length| is always a
* multiple of 4 when |length| >= 4.
*
* TODO(rtoy): Figure out how to process 8 elements at a time
* using intrinsics or replace this with inline assembly.
*/
do {
float32x4_t x = vld1q_f32(data);
length -= 4;
x = vmulq_n_f32(x, scale);
vst1q_f32(data, x);
data += 4;
} while (length > 0);
} else if (length == 2) {
float32x2_t x = vld1_f32(data);
x = vmul_n_f32(x, scale);
vst1_f32(data, x);
} else {
fftData[0] *= scale;
}
}
void test_vmul_nf32 (void)
{
float32x2_t out_float32x2_t;
float32x2_t arg0_float32x2_t;
float32_t arg1_float32_t;
out_float32x2_t = vmul_n_f32 (arg0_float32x2_t, arg1_float32_t);
}
