imdct_step3_iter0_loop()

static void fl::third_party::vorbis::imdct_step3_iter0_loop ( int32_t n, float * e, int32_t i_off, int32_t k_off, float * A )

static

Definition at line 2136 of file stb_vorbis.cpp.hpp.

{
   float *ee0 = e + i_off;
   float *ee2 = ee0 + k_off;
   int32_t i;
 
   FL_ASSERT((n & 3) == 0, "n must be multiple of 4");
   for (i=(n>>2); i > 0; --i) {
      float k00_20, k01_21;
      k00_20  = ee0[ 0] - ee2[ 0];
      k01_21  = ee0[-1] - ee2[-1];
      ee0[ 0] += ee2[ 0];//ee0[ 0] = ee0[ 0] + ee2[ 0];
      ee0[-1] += ee2[-1];//ee0[-1] = ee0[-1] + ee2[-1];
      ee2[ 0] = k00_20 * A[0] - k01_21 * A[1];
      ee2[-1] = k01_21 * A[0] + k00_20 * A[1];
      A += 8;
 
      k00_20  = ee0[-2] - ee2[-2];
      k01_21  = ee0[-3] - ee2[-3];
      ee0[-2] += ee2[-2];//ee0[-2] = ee0[-2] + ee2[-2];
      ee0[-3] += ee2[-3];//ee0[-3] = ee0[-3] + ee2[-3];
      ee2[-2] = k00_20 * A[0] - k01_21 * A[1];
      ee2[-3] = k01_21 * A[0] + k00_20 * A[1];
      A += 8;
 
      k00_20  = ee0[-4] - ee2[-4];
      k01_21  = ee0[-5] - ee2[-5];
      ee0[-4] += ee2[-4];//ee0[-4] = ee0[-4] + ee2[-4];
      ee0[-5] += ee2[-5];//ee0[-5] = ee0[-5] + ee2[-5];
      ee2[-4] = k00_20 * A[0] - k01_21 * A[1];
      ee2[-5] = k01_21 * A[0] + k00_20 * A[1];
      A += 8;
 
      k00_20  = ee0[-6] - ee2[-6];
      k01_21  = ee0[-7] - ee2[-7];
      ee0[-6] += ee2[-6];//ee0[-6] = ee0[-6] + ee2[-6];
      ee0[-7] += ee2[-7];//ee0[-7] = ee0[-7] + ee2[-7];
      ee2[-6] = k00_20 * A[0] - k01_21 * A[1];
      ee2[-7] = k01_21 * A[0] + k00_20 * A[1];
      A += 8;
      ee0 -= 8;
      ee2 -= 8;
   }
}

References FL_ASSERT, and FL_NOEXCEPT.

Referenced by inverse_mdct().

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