imdct_step3_inner_s_loop_ld654()

static void fl::third_party::vorbis::imdct_step3_inner_s_loop_ld654 ( int32_t n, float * e, int32_t i_off, float * A, int32_t base_n )

static

Definition at line 2315 of file stb_vorbis.cpp.hpp.

{
   int32_t a_off = base_n >> 3;
   // Renamed from A2 to avoid conflict with Arduino analog pin macro
   float aa2 = A[0+a_off];
   float *z = e + i_off;
   float *base = z - 16 * n;
 
   while (z > base) {
      float k00,k11;
      float l00,l11;
 
      k00    = z[-0] - z[ -8];
      k11    = z[-1] - z[ -9];
      l00    = z[-2] - z[-10];
      l11    = z[-3] - z[-11];
      z[ -0] = z[-0] + z[ -8];
      z[ -1] = z[-1] + z[ -9];
      z[ -2] = z[-2] + z[-10];
      z[ -3] = z[-3] + z[-11];
      z[ -8] = k00;
      z[ -9] = k11;
      z[-10] = (l00+l11) * aa2;
      z[-11] = (l11-l00) * aa2;
 
      k00    = z[ -4] - z[-12];
      k11    = z[ -5] - z[-13];
      l00    = z[ -6] - z[-14];
      l11    = z[ -7] - z[-15];
      z[ -4] = z[ -4] + z[-12];
      z[ -5] = z[ -5] + z[-13];
      z[ -6] = z[ -6] + z[-14];
      z[ -7] = z[ -7] + z[-15];
      z[-12] = k11;
      z[-13] = -k00;
      z[-14] = (l11-l00) * aa2;
      z[-15] = (l00+l11) * -aa2;
 
      iter_54(z);
      iter_54(z-8);
      z -= 16;
   }
}

References FL_NOEXCEPT, iter_54(), and z.

Referenced by inverse_mdct().

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