| @// |
| @// Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
| @// |
| @// Use of this source code is governed by a BSD-style license |
| @// that can be found in the LICENSE file in the root of the source |
| @// tree. An additional intellectual property rights grant can be found |
| @// in the file PATENTS. All contributing project authors may |
| @// be found in the AUTHORS file in the root of the source tree. |
| @// |
| @// This file was originally licensed as follows. It has been |
| @// relicensed with permission from the copyright holders. |
| @// |
| |
| @// |
| @// File Name: armSP_FFT_CToC_SC32_Radix2_ls_unsafe_s.s |
| @// OpenMAX DL: v1.0.2 |
| @// Last Modified Revision: 7493 |
| @// Last Modified Date: Mon, 24 Sep 2007 |
| @// |
| @// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| @// |
| @// |
| @// |
| @// Description: |
| @// Compute the last stage of a Radix 2 DIT in-order out-of-place FFT |
| @// stage for a N point complex signal. |
| @// |
| |
| |
| |
| @// Include standard headers |
| |
| #include "dl/api/armCOMM_s.h" |
| #include "dl/api/omxtypes_s.h" |
| |
| |
| @// Import symbols required from other files |
| @// (For example tables) |
| |
| |
| |
| |
| @// Set debugging level |
| @//DEBUG_ON SETL {TRUE} |
| |
| |
| @// Guarding implementation by the processor name |
| |
| |
| @//Input Registers |
| |
| #define pSrc r0 |
| #define pDst r2 |
| #define pTwiddle r1 |
| #define subFFTNum r6 |
| #define subFFTSize r7 |
| |
| |
| @//Output Registers |
| |
| |
| @//Local Scratch Registers |
| |
| |
| #define outPointStep r3 |
| #define grpCount r4 |
| #define dstStep r5 |
| #define pTmp r4 |
| |
| @// Neon Registers |
| |
| #define dWr D0.S32 |
| #define dWi d1.s32 |
| #define dXr0 d2.s32 |
| #define dXi0 d3.s32 |
| #define dXr1 d4.s32 |
| #define dXi1 d5.s32 |
| #define dYr0 d6.s32 |
| #define dYi0 d7.s32 |
| #define dYr1 d8.s32 |
| #define dYi1 d9.s32 |
| #define qT0 q5.s64 |
| #define qT1 q6.s64 |
| |
| .macro FFTSTAGE scaled, inverse, name |
| |
| |
| MOV outPointStep,subFFTSize,LSL #3 |
| @// Update grpCount and grpSize rightaway |
| |
| MOV subFFTNum,#1 @//after the last stage |
| LSL grpCount,subFFTSize,#1 |
| |
| @// update subFFTSize for the next stage |
| MOV subFFTSize,grpCount |
| |
| RSB dstStep,outPointStep,#16 |
| |
| |
| @// Loop on 2 grps at a time for the last stage |
| |
| grpLoop\name : |
| VLD2 {dWr,dWi},[pTwiddle :64]! |
| |
| VLD4 {dXr0,dXi0,dXr1,dXi1},[pSrc :128]! |
| SUBS grpCount,grpCount,#4 @// grpCount is multiplied by 2 |
| |
| .ifeqs "\inverse", "TRUE" |
| VMULL qT0,dWr,dXr1 |
| VMLAL qT0,dWi,dXi1 @// real part |
| VMULL qT1,dWr,dXi1 |
| VMLSL qT1,dWi,dXr1 @// imag part |
| |
| .else |
| |
| VMULL qT0,dWr,dXr1 |
| VMLSL qT0,dWi,dXi1 @// real part |
| VMULL qT1,dWr,dXi1 |
| VMLAL qT1,dWi,dXr1 @// imag part |
| |
| .endif |
| |
| VRSHRN dXr1,qT0,#31 |
| VRSHRN dXi1,qT1,#31 |
| |
| |
| .ifeqs "\scaled", "TRUE" |
| |
| VHSUB dYr0,dXr0,dXr1 |
| VHSUB dYi0,dXi0,dXi1 |
| VHADD dYr1,dXr0,dXr1 |
| VHADD dYi1,dXi0,dXi1 |
| |
| .else |
| |
| VSUB dYr0,dXr0,dXr1 |
| VSUB dYi0,dXi0,dXi1 |
| VADD dYr1,dXr0,dXr1 |
| VADD dYi1,dXi0,dXi1 |
| |
| |
| .endif |
| |
| VST2 {dYr0,dYi0},[pDst],outPointStep |
| VST2 {dYr1,dYi1},[pDst],dstStep @// dstStep = step = -outPointStep + 16 |
| |
| bgt grpLoop\name |
| |
| |
| @// Reset and Swap pSrc and pDst for the next stage |
| MOV pTmp,pDst |
| SUB pDst,pSrc,outPointStep,LSL #1 @// pDst -= 4*size; pSrc -= 8*size bytes |
| SUB pSrc,pTmp,outPointStep |
| |
| @// Reset pTwiddle for the next stage |
| SUB pTwiddle,pTwiddle,outPointStep @// pTwiddle -= 4*size bytes |
| |
| .endm |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC32_Radix2_ls_OutOfPlace_unsafe,r4,"" |
| FFTSTAGE "FALSE","FALSE",fwd |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC32_Radix2_ls_OutOfPlace_unsafe,r4 |
| FFTSTAGE "FALSE","TRUE",inv |
| M_END |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC32_Sfs_Radix2_ls_OutOfPlace_unsafe,r4 |
| FFTSTAGE "TRUE","FALSE",fwdsfs |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC32_Sfs_Radix2_ls_OutOfPlace_unsafe,r4 |
| FFTSTAGE "TRUE","TRUE",invsfs |
| M_END |
| |
| .end |