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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 is a modification of armSP_FFT_CToC_FC32_Radix8_fs_unsafe_s.s
@// to support float instead of SC32.
@//
@//
@// Description:
@// Compute a first stage Radix 8 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
@// dest buffer for the next stage (not pSrc for first stage)
#define pPingPongBuf r5
@//Output Registers
@//Local Scratch Registers
#define grpSize r3
@// Reuse grpSize as setCount
#define setCount r3
#define pointStep r4
#define outPointStep r4
#define setStep r8
#define step1 r9
#define step2 r10
#define t0 r11
@// Neon Registers
#define dXr0 D0.F32
#define dXi0 D1.F32
#define dXr1 D2.F32
#define dXi1 D3.F32
#define dXr2 D4.F32
#define dXi2 D5.F32
#define dXr3 D6.F32
#define dXi3 D7.F32
#define dXr4 D8.F32
#define dXi4 D9.F32
#define dXr5 D10.F32
#define dXi5 D11.F32
#define dXr6 D12.F32
#define dXi6 D13.F32
#define dXr7 D14.F32
#define dXi7 D15.F32
#define qX0 Q0.F32
#define qX1 Q1.F32
#define qX2 Q2.F32
#define qX3 Q3.F32
#define qX4 Q4.F32
#define qX5 Q5.F32
#define qX6 Q6.F32
#define qX7 Q7.F32
#define dUr0 D16.F32
#define dUi0 D17.F32
#define dUr2 D18.F32
#define dUi2 D19.F32
#define dUr4 D20.F32
#define dUi4 D21.F32
#define dUr6 D22.F32
#define dUi6 D23.F32
#define dUr1 D24.F32
#define dUi1 D25.F32
#define dUr3 D26.F32
#define dUi3 D27.F32
#define dUr5 D28.F32
#define dUi5 D29.F32
@// reuse dXr7 and dXi7
#define dUr7 D30.F32
#define dUi7 D31.F32
#define qU0 Q8.F32
#define qU1 Q12.F32
#define qU2 Q9.F32
#define qU3 Q13.F32
#define qU4 Q10.F32
#define qU5 Q14.F32
#define qU6 Q11.F32
#define qU7 Q15.F32
#define dVr0 D24.F32
#define dVi0 D25.F32
#define dVr2 D26.F32
#define dVi2 D27.F32
#define dVr4 D28.F32
#define dVi4 D29.F32
#define dVr6 D30.F32
#define dVi6 D31.F32
#define dVr1 D16.F32
#define dVi1 D17.F32
#define dVr3 D18.F32
#define dVi3 D19.F32
#define dVr5 D20.F32
#define dVi5 D21.F32
#define dVr7 D22.F32
#define dVi7 D23.F32
#define qV0 Q12.F32
#define qV1 Q8.F32
#define qV2 Q13.F32
#define qV3 Q9.F32
#define qV4 Q14.F32
#define qV5 Q10.F32
#define qV6 Q15.F32
#define qV7 Q11.F32
#define dYr0 D16.F32
#define dYi0 D17.F32
#define dYr2 D18.F32
#define dYi2 D19.F32
#define dYr4 D20.F32
#define dYi4 D21.F32
#define dYr6 D22.F32
#define dYi6 D23.F32
#define dYr1 D24.F32
#define dYi1 D25.F32
#define dYr3 D26.F32
#define dYi3 D27.F32
#define dYr5 D28.F32
#define dYi5 D29.F32
#define dYr7 D30.F32
#define dYi7 D31.F32
#define qY0 Q8.F32
#define qY1 Q12.F32
#define qY2 Q9.F32
#define qY3 Q13.F32
#define qY4 Q10.F32
#define qY5 Q14.F32
#define qY6 Q11.F32
#define qY7 Q15.F32
#define dT0 D14.F32
#define dT1 D15.F32
.MACRO FFTSTAGE scaled, inverse, name
@// Define stack arguments
@// Update pSubFFTSize and pSubFFTNum regs
@// subFFTSize = 1 for the first stage
MOV subFFTSize,#8
ADR t0,ONEBYSQRT2\name
@// Note: setCount = subFFTNum/8 (reuse the grpSize reg for setCount)
LSR grpSize,subFFTNum,#3
MOV subFFTNum,grpSize
@// pT0+1 increments pT0 by 8 bytes
@// pT0+pointStep = increment of 8*pointStep bytes = grpSize bytes
@// Note: outPointStep = pointStep for firststage
MOV pointStep,grpSize,LSL #3
@// Calculate the step of input data for the next set
@//MOV step1,pointStep,LSL #1 @// step1 = 2*pointStep
VLD2 {dXr0,dXi0},[pSrc, :128],pointStep @// data[0]
MOV step1,grpSize,LSL #4
MOV step2,pointStep,LSL #3
VLD2 {dXr1,dXi1},[pSrc, :128],pointStep @// data[1]
SUB step2,step2,pointStep @// step2 = 7*pointStep
@// setStep = - 7*pointStep+16
RSB setStep,step2,#16
VLD2 {dXr2,dXi2},[pSrc, :128],pointStep @// data[2]
VLD2 {dXr3,dXi3},[pSrc, :128],pointStep @// data[3]
VLD2 {dXr4,dXi4},[pSrc, :128],pointStep @// data[4]
VLD2 {dXr5,dXi5},[pSrc, :128],pointStep @// data[5]
VLD2 {dXr6,dXi6},[pSrc, :128],pointStep @// data[6]
@// data[7] & update pSrc for the next set
@// setStep = -7*pointStep + 16
VLD2 {dXr7,dXi7},[pSrc, :128],setStep
@// grp = 0 a special case since all the twiddle factors are 1
@// Loop on the sets
radix8fsGrpZeroSetLoop\name :
@// Decrement setcount
SUBS setCount,setCount,#2
@// finish first stage of 8 point FFT
VADD qU0,qX0,qX4
VADD qU2,qX1,qX5
VADD qU4,qX2,qX6
VADD qU6,qX3,qX7
@// finish second stage of 8 point FFT
VADD qV0,qU0,qU4
VSUB qV2,qU0,qU4
VADD qV4,qU2,qU6
VSUB qV6,qU2,qU6
@// finish third stage of 8 point FFT
VADD qY0,qV0,qV4
VSUB qY4,qV0,qV4
VST2 {dYr0,dYi0},[pDst, :128],step1 @// store y0
.ifeqs "\inverse", "TRUE"
VSUB dYr2,dVr2,dVi6
VADD dYi2,dVi2,dVr6
VADD dYr6,dVr2,dVi6
VST2 {dYr2,dYi2},[pDst, :128],step1 @// store y2
VSUB dYi6,dVi2,dVr6
VSUB qU1,qX0,qX4
VST2 {dYr4,dYi4},[pDst, :128],step1 @// store y4
VSUB qU3,qX1,qX5
VSUB qU5,qX2,qX6
VST2 {dYr6,dYi6},[pDst, :128],step1 @// store y6
.ELSE
VADD dYr6,dVr2,dVi6
VSUB dYi6,dVi2,dVr6
VSUB dYr2,dVr2,dVi6
VST2 {dYr6,dYi6},[pDst, :128],step1 @// store y2
VADD dYi2,dVi2,dVr6
VSUB qU1,qX0,qX4
VST2 {dYr4,dYi4},[pDst, :128],step1 @// store y4
VSUB qU3,qX1,qX5
VSUB qU5,qX2,qX6
VST2 {dYr2,dYi2},[pDst, :128],step1 @// store y6
.ENDIF
@// finish first stage of 8 point FFT
VSUB qU7,qX3,qX7
VLD1 dT0[0], [t0]
@// finish second stage of 8 point FFT
VSUB dVr1,dUr1,dUi5
@// data[0] for next iteration
VLD2 {dXr0,dXi0},[pSrc, :128],pointStep
VADD dVi1,dUi1,dUr5
VADD dVr3,dUr1,dUi5
VLD2 {dXr1,dXi1},[pSrc, :128],pointStep @// data[1]
VSUB dVi3,dUi1,dUr5
VSUB dVr5,dUr3,dUi7
VLD2 {dXr2,dXi2},[pSrc, :128],pointStep @// data[2]
VADD dVi5,dUi3,dUr7
VADD dVr7,dUr3,dUi7
VLD2 {dXr3,dXi3},[pSrc, :128],pointStep @// data[3]
VSUB dVi7,dUi3,dUr7
@// finish third stage of 8 point FFT
.ifeqs "\inverse", "TRUE"
@// calculate a*v5
VMUL dT1,dVr5,dT0[0] @// use dVi0 for dT1
VLD2 {dXr4,dXi4},[pSrc, :128],pointStep @// data[4]
VMUL dVi5,dVi5,dT0[0]
VLD2 {dXr5,dXi5},[pSrc, :128],pointStep @// data[5]
VSUB dVr5,dT1,dVi5 @// a * V5
VADD dVi5,dT1,dVi5
VLD2 {dXr6,dXi6},[pSrc, :128],pointStep @// data[6]
@// calculate b*v7
VMUL dT1,dVr7,dT0[0]
VMUL dVi7,dVi7,dT0[0]
VADD qY1,qV1,qV5
VSUB qY5,qV1,qV5
VADD dVr7,dT1,dVi7 @// b * V7
VSUB dVi7,dVi7,dT1
SUB pDst, pDst, step2 @// set pDst to y1
@// On the last iteration, this will read past the end of pSrc,
@// so skip this read.
BEQ radix8SkipLastUpdateInv\name
VLD2 {dXr7,dXi7},[pSrc, :128],setStep @// data[7]
radix8SkipLastUpdateInv\name:
VSUB dYr3,dVr3,dVr7
VSUB dYi3,dVi3,dVi7
VST2 {dYr1,dYi1},[pDst, :128],step1 @// store y1
VADD dYr7,dVr3,dVr7
VADD dYi7,dVi3,dVi7
VST2 {dYr3,dYi3},[pDst, :128],step1 @// store y3
VST2 {dYr5,dYi5},[pDst, :128],step1 @// store y5
VST2 {dYr7,dYi7},[pDst, :128] @// store y7
ADD pDst, pDst, #16
.ELSE
@// calculate b*v7
VMUL dT1,dVr7,dT0[0]
VLD2 {dXr4,dXi4},[pSrc, :128],pointStep @// data[4]
VMUL dVi7,dVi7,dT0[0]
VLD2 {dXr5,dXi5},[pSrc, :128],pointStep @// data[5]
VADD dVr7,dT1,dVi7 @// b * V7
VSUB dVi7,dVi7,dT1
VLD2 {dXr6,dXi6},[pSrc, :128],pointStep @// data[6]
@// calculate a*v5
VMUL dT1,dVr5,dT0[0] @// use dVi0 for dT1
VMUL dVi5,dVi5,dT0[0]
VADD dYr7,dVr3,dVr7
VADD dYi7,dVi3,dVi7
SUB pDst, pDst, step2 @// set pDst to y1
VSUB dVr5,dT1,dVi5 @// a * V5
VADD dVi5,dT1,dVi5
@// On the last iteration, this will read past the end of pSrc,
@// so skip this read.
BEQ radix8SkipLastUpdateFwd\name
VLD2 {dXr7,dXi7},[pSrc, :128],setStep @// data[7]
radix8SkipLastUpdateFwd\name:
VSUB qY5,qV1,qV5
VSUB dYr3,dVr3,dVr7
VST2 {dYr7,dYi7},[pDst, :128],step1 @// store y1
VSUB dYi3,dVi3,dVi7
VADD qY1,qV1,qV5
VST2 {dYr5,dYi5},[pDst, :128],step1 @// store y3
VST2 {dYr3,dYi3},[pDst, :128],step1 @// store y5
VST2 {dYr1,dYi1},[pDst, :128]! @// store y7
.ENDIF
@// update pDst for the next set
SUB pDst, pDst, step2
BGT radix8fsGrpZeroSetLoop\name
@// reset pSrc to pDst for the next stage
SUB pSrc,pDst,pointStep @// pDst -= 2*grpSize
MOV pDst,pPingPongBuf
.endm
@// Allocate stack memory required by the function
M_START armSP_FFTFwd_CToC_FC32_Radix8_fs_OutOfPlace_unsafe,r4
FFTSTAGE "FALSE","FALSE",FWD
M_END
ONEBYSQRT2FWD: .float 0.7071067811865476e0
M_START armSP_FFTInv_CToC_FC32_Radix8_fs_OutOfPlace_unsafe,r4
FFTSTAGE "FALSE","TRUE",INV
M_END
ONEBYSQRT2INV: .float 0.7071067811865476e0
.end
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