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@//
@// 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_SC16_Radix2_unsafe_s.s
@// OpenMAX DL: v1.0.2
@// Last Modified Revision: 5892
@// Last Modified Date: Thu, 07 Jun 2007
@//
@// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
@//
@//
@//
@// Description:
@// Compute a Radix 2 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
@// 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 pointStep r4
#define grpCount r5
#define setCount r8
#define step r10
#define dstStep r11
#define pTmp r9
@// Neon Registers
#define dW D0.S16
#define dX0 D2.S16
#define dX1 D3.S16
#define dX2 D4.S16
#define dX3 D5.S16
#define dY0 D6.S16
#define dY1 D7.S16
#define dY2 D8.S16
#define dY3 D9.S16
#define qT0 Q3.S32
#define qT1 Q4.S32
.MACRO FFTSTAGE scaled, inverse, name
@// Define stack arguments
@// Update grpCount and grpSize rightaway inorder to reuse pGrpCount and pGrpSize regs
LSR subFFTNum,subFFTNum,#1 @//grpSize
LSL grpCount,subFFTSize,#1
@// pT0+1 increments pT0 by 8 bytes
@// pT0+pointStep = increment of 4*pointStep bytes = 2*grpSize bytes
MOV pointStep,subFFTNum,LSL #1
@// update subFFTSize for the next stage
MOV subFFTSize,grpCount
@// pOut0+1 increments pOut0 by 8 bytes
@// pOut0+outPointStep == increment of 4*outPointStep bytes = 2*size bytes
SMULBB outPointStep,grpCount,pointStep
LSL pointStep,pointStep,#1
RSB step,pointStep,#16
RSB dstStep,outPointStep,#16
@// Loop on the groups
grpLoop\name:
VLD1 dW,[pTwiddle],pointStep @//[wi | wr]
MOV setCount,pointStep,LSR #2
@// Loop on the sets: 4 at a time
setLoop\name:
VLD2 {dX0,dX1},[pSrc],pointStep @// point0: dX0-real part dX1-img part
VLD2 {dX2,dX3},[pSrc],step @// point1: dX2-real part dX3-img part
SUBS setCount,setCount,#4
.ifeqs "\inverse", "TRUE"
VMULL qT0,dX2,dW[0]
VMLAL qT0,dX3,dW[1] @// real part
VMULL qT1,dX3,dW[0]
VMLSL qT1,dX2,dW[1] @// imag part
.ELSE
VMULL qT0,dX2,dW[0]
VMLSL qT0,dX3,dW[1] @// real part
VMULL qT1,dX3,dW[0]
VMLAL qT1,dX2,dW[1] @// imag part
.ENDIF
VRSHRN dX2,qT0,#15
VRSHRN dX3,qT1,#15
.ifeqs "\scaled", "TRUE"
VHSUB dY0,dX0,dX2
VHSUB dY1,dX1,dX3
VHADD dY2,dX0,dX2
VHADD dY3,dX1,dX3
.ELSE
VSUB dY0,dX0,dX2
VSUB dY1,dX1,dX3
VADD dY2,dX0,dX2
VADD dY3,dX1,dX3
.ENDIF
VST2 {dY0,dY1},[pDst],outPointStep
VST2 {dY2,dY3},[pDst],dstStep @// dstStep = -outPointStep + 16
BGT setLoop\name
SUBS grpCount,grpCount,#2
ADD pSrc,pSrc,pointStep
BGT grpLoop\name
@// Reset and Swap pSrc and pDst for the next stage
MOV pTmp,pDst
SUB pDst,pSrc,outPointStep,LSL #1 @// pDst -= 2*size; pSrc -= 4*size bytes
SUB pSrc,pTmp,outPointStep
@// Reset pTwiddle for the next stage
SUB pTwiddle,pTwiddle,outPointStep @// pTwiddle -= 2*size bytes
.endm
M_START armSP_FFTFwd_CToC_SC16_Radix2_OutOfPlace_unsafe,r4
FFTSTAGE "FALSE","FALSE",FWD
M_END
M_START armSP_FFTInv_CToC_SC16_Radix2_OutOfPlace_unsafe,r4
FFTSTAGE "FALSE","TRUE",INV
M_END
M_START armSP_FFTFwd_CToC_SC16_Sfs_Radix2_OutOfPlace_unsafe,r4
FFTSTAGE "TRUE","FALSE",FWDSFS
M_END
M_START armSP_FFTInv_CToC_SC16_Sfs_Radix2_OutOfPlace_unsafe,r4
FFTSTAGE "TRUE","TRUE",INVSFS
M_END
.END
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