1 /* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 * 10 */ 11 12 #include "dl/api/omxtypes.h" 13 14 void x86SP_FFT_CToC_FC32_Fwd_Radix4_ls( 15 const OMX_F32 *in, 16 OMX_F32 *out, 17 const OMX_F32 *twiddle, 18 OMX_INT n) { 19 OMX_INT n_by_2 = n >> 1; 20 OMX_INT n_by_4 = n >> 2; 21 OMX_INT n_mul_2 = n << 1; 22 OMX_INT i; 23 OMX_F32 *out0 = out; 24 25 for (i = 0; i < n_by_2; i += 2) { 26 OMX_FC32 t0; 27 OMX_FC32 t1; 28 OMX_FC32 t2; 29 OMX_FC32 t3; 30 OMX_FC32 tt1; 31 OMX_FC32 tt2; 32 OMX_FC32 tt3; 33 const OMX_F32 *tw1 = twiddle + i; 34 const OMX_F32 *tw2 = tw1 + i; 35 const OMX_F32 *tw3 = tw2 + i; 36 const OMX_F32 *in0 = in + (i << 1); 37 const OMX_F32 *in1 = in0 + 1; 38 const OMX_F32 *in2 = in1 + 1; 39 const OMX_F32 *in3 = in2 + 1; 40 OMX_F32 *out1 = out0 + n_by_4; 41 OMX_F32 *out2 = out1 + n_by_4; 42 OMX_F32 *out3 = out2 + n_by_4; 43 44 // CMUL tt1, tw1, in1 45 tt1.Re = tw1[0] * in1[0] - tw1[n_mul_2] * in1[n]; 46 tt1.Im = tw1[0] * in1[n] + tw1[n_mul_2] * in1[0]; 47 48 // CMUL tt2, tw2, in2 49 tt2.Re = tw2[0] * in2[0] - tw2[n_mul_2] * in2[n]; 50 tt2.Im = tw2[0] * in2[n] + tw2[n_mul_2] * in2[0]; 51 52 // CMUL tt3, tw3, in3 53 tt3.Re = tw3[0] * in3[0] - tw3[n_mul_2] * in3[n]; 54 tt3.Im = tw3[0] * in3[n] + tw3[n_mul_2] * in3[0]; 55 56 // CADD t0, in0, tt2 57 t0.Re = in0[0] + tt2.Re; 58 t0.Im = in0[n] + tt2.Im; 59 60 // CSUB t1, in0, tt2 61 t1.Re = in0[0] - tt2.Re; 62 t1.Im = in0[n] - tt2.Im; 63 64 // CADD t2, tt1, tt3 65 t2.Re = tt1.Re + tt3.Re; 66 t2.Im = tt1.Im + tt3.Im; 67 68 // CSUB t3, tt1, tt3 69 t3.Re = tt1.Re - tt3.Re; 70 t3.Im = tt1.Im - tt3.Im; 71 72 // CADD out0, t0, t2 73 out0[0] = t0.Re + t2.Re; 74 out0[n] = t0.Im + t2.Im; 75 76 // CSUB out2, t0, t2 77 out2[0] = t0.Re - t2.Re; 78 out2[n] = t0.Im - t2.Im; 79 80 // CADD_SUB_X out1, t1, t3 81 out1[0] = t1.Re + t3.Im; 82 out1[n] = t1.Im - t3.Re; 83 84 // CSUB_ADD_X out3, t1, t3 85 out3[0] = t1.Re - t3.Im; 86 out3[n] = t1.Im + t3.Re; 87 88 out0 += 1; 89 } 90 } 91
