mp3d_imdct36_twiddle()

static MP3D_KERNEL void mp3d_imdct36_twiddle ( int32_t * grbuf, int32_t * overlap, const int32_t * window, const int32_t * co, const int32_t * si )

static

Definition at line 421 of file minimp3_synth_fixed.h.

{
    int i;
#if MP3D_SIMD_KERNELS_LIVE
    if (MP3D_SIMD_AVAILABLE())
    {
        mp3d_imdct36_twiddle_simd(grbuf, overlap, window, co, si);
        return;
    }
#endif
    for (i = 0; i < 9; i++)
    {
        const int32_t ovl = overlap[i];
        const int32_t sum = mp3d_narrow_q30(
            (int64_t)co[i]*g_twid9_q30[9 + i] +
            (int64_t)si[i]*g_twid9_q30[0 + i]);
        overlap[i] = mp3d_narrow_q30(
            (int64_t)co[i]*g_twid9_q30[0 + i] -
            (int64_t)si[i]*g_twid9_q30[9 + i]);
        grbuf[i] = mp3d_narrow_q30(
            (int64_t)ovl*window[0 + i] - (int64_t)sum*window[9 + i]);
        grbuf[17 - i] = mp3d_narrow_q30(
            (int64_t)ovl*window[9 + i] + (int64_t)sum*window[0 + i]);
    }
}

References FL_NO_EXCEPT, and g_twid9_q30.