CMSIS/DSP/Scripts/genMVETwiddleCoefs.py

import numpy as np
import math
import argparse

parser = argparse.ArgumentParser(description='Generate C arrays')
parser.add_argument('-f', nargs='?',type = str, default="../Source/CommonTables/arm_mve_tables.c", help="C File path")
parser.add_argument('-he', nargs='?',type = str, default="../Include/arm_mve_tables.h", help="H File path")

args = parser.parse_args()

COLLIM = 80 

condition="""#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || defined(ARM_TABLE_TWIDDLECOEF_F32_%d) || defined(ARM_TABLE_TWIDDLECOEF_F32_%d)
"""

def printCUInt32Array(f,name,arr):
    nb = 0
    print("uint32_t %s[%d]={" % (name,len(arr)),file=f)

    for d in arr:
        val = "%d," % d
        nb = nb + len(val)
        if nb > COLLIM:
            print("",file=f)
            nb = len(val)
        print(val,end="",file=f)

    print("};\n",file=f)

def printCFloat32Array(f,name,arr):
    nb = 0
    print("float32_t %s[%d]={" % (name,len(arr)),file=f)

    for d in arr:
        val = "%.20ff," % d
        nb = nb + len(val)
        if nb > COLLIM:
            print("",file=f)
            nb = len(val)
        print(val,end="",file=f)

    print("};\n",file=f)

def printHUInt32Array(f,name,arr):
 print("extern uint32_t %s[%d];" % (name,len(arr)),file=f)

def printHFloat32Array(f,name,arr):
 print("extern float32_t %s[%d];" % (name,len(arr)),file=f)

def twiddle(n):
    a=2.0*math.pi*np.linspace(0,n,num=n,endpoint=False)/n
    c=np.cos(a)
    s=np.sin(a)

    r = np.empty((c.size + s.size,), dtype=c.dtype)
    r[0::2] = c
    r[1::2] = s
    return(r)

def reorderTwiddle(f,h,n):
    numStages = 6
    coefs= twiddle(n)

    
    if n == 4096:                                                                                
       numStages = 6  
       arraySize = 1364                                                
                                                                                                   
    if n == 1024:                                                                                
       numStages = 5  
       arraySize = 340                                                                     
                                                                                                   
    if n == 256:                                                                                 
       numStages = 4
       arraySize = 84                                                                        

    if n == 64:                                                                                  
       numStages = 3 
       arraySize = 20                                                                       
                                                                                                   
    if n == 16:                                                                                  
       numStages = 2 
       arraySize = 4

    incr = 1
    nbOfElt = n

    maxNb = 0

    tab1 = np.zeros(2*arraySize)
    tab2 = np.zeros(2*arraySize)
    tab3 = np.zeros(2*arraySize)

    tab1Index=0
    tab2Index=0
    tab3Index=0

    tab1Offset = np.zeros(numStages)
    tab2Offset = np.zeros(numStages)
    tab3Offset = np.zeros(numStages)



    for stage in range(0,numStages-1):  
        nbOfElt = nbOfElt >> 2                                                               
        pVectCoef1 = 0
        pVectCoef2 = 0
        pVectCoef3 = 0

        tab1Offset[stage] = tab1Index
        tab2Offset[stage] = tab2Index
        tab3Offset[stage] = tab3Index
        
        for i in range(0,nbOfElt):
            tab1[tab1Index] = coefs[pVectCoef1]                               
            tab1[tab1Index + 1] = coefs[pVectCoef1 + 1];  
            tab1Index = tab1Index + 2
            pVectCoef1 = pVectCoef1 + (incr * 1 * 2)

            tab2[tab2Index] = coefs[pVectCoef2]                               
            tab2[tab2Index + 1] = coefs[pVectCoef2 + 1];  
            tab2Index = tab2Index + 2
            pVectCoef2 = pVectCoef2 + (incr * 2 * 2)

            tab3[tab3Index] = coefs[pVectCoef3]                               
            tab3[tab3Index + 1] = coefs[pVectCoef3 + 1];  
            tab3Index = tab3Index + 2
            pVectCoef3 = pVectCoef3 + (incr * 3 * 2)

            maxNb = maxNb + 1

        incr = 4 * incr

    print(condition % (n, n << 1),file=f)
    print(condition % (n, n << 1),file=h)
    printCUInt32Array(f,"rearranged_twiddle_tab_stride1_arr_%d" % n,list(tab1Offset))
    printHUInt32Array(h,"rearranged_twiddle_tab_stride1_arr_%d" % n,list(tab1Offset)) 

    printCUInt32Array(f,"rearranged_twiddle_tab_stride2_arr_%d" % n,list(tab2Offset))
    printHUInt32Array(h,"rearranged_twiddle_tab_stride2_arr_%d" % n,list(tab2Offset))
   
    printCUInt32Array(f,"rearranged_twiddle_tab_stride3_arr_%d" % n,list(tab3Offset))
    printHUInt32Array(h,"rearranged_twiddle_tab_stride3_arr_%d" % n,list(tab3Offset))

    printCFloat32Array(f,"rearranged_twiddle_stride1_%d" % n,list(tab1))
    printHFloat32Array(h,"rearranged_twiddle_stride1_%d" % n,list(tab1))

    printCFloat32Array(f,"rearranged_twiddle_stride2_%d" % n,list(tab2))
    printHFloat32Array(h,"rearranged_twiddle_stride2_%d" % n,list(tab2))

    printCFloat32Array(f,"rearranged_twiddle_stride3_%d" % n,list(tab3))
    printHFloat32Array(h,"rearranged_twiddle_stride3_%d" % n,list(tab3))
    print("#endif\n",file=f)
    print("#endif\n",file=h)



#test = twiddle(16)
#printCFloat32Array("Test",list(test))

cheader="""/* ----------------------------------------------------------------------
 * Project:      CMSIS DSP Library
 * Title:        arm_mve_tables.c
 * Description:  common tables like fft twiddle factors, Bitreverse, reciprocal etc
 *               used for MVE implementation only
 *
 * $Date:        08. January 2020
 * $Revision:    V1.7.0
 *
 * Target Processor: Cortex-M cores
 * -------------------------------------------------------------------- */
/*
 * Copyright (C) 2010-2020 ARM Limited or its affiliates. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 #include "arm_math.h"

 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)

 #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_FFT_ALLOW_TABLES)


 """ 

cfooter="""

#endif /* !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_FFT_ALLOW_TABLES) */
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
"""

hheader="""/* ----------------------------------------------------------------------
 * Project:      CMSIS DSP Library
 * Title:        arm_mve_tables.h
 * Description:  common tables like fft twiddle factors, Bitreverse, reciprocal etc
 *               used for MVE implementation only
 *
 * $Date:        08. January 2020
 * $Revision:    V1.7.0
 *
 * Target Processor: Cortex-M cores
 * -------------------------------------------------------------------- */
/*
 * Copyright (C) 2010-2020 ARM Limited or its affiliates. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 #ifndef _ARM_MVE_TABLES_H
 #define _ARM_MVE_TABLES_H

 #include "arm_math.h"

 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)

 #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_FFT_ALLOW_TABLES)


 """ 

hfooter="""
#endif /* !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_FFT_ALLOW_TABLES) */

#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */

#endif /*_ARM_MVE_TABLES_H*/
"""

with open(args.f,'w') as f:
  with open(args.he,'w') as h:
     print(cheader,file=f)
     print(hheader,file=h)

     reorderTwiddle(f,h,16)
     reorderTwiddle(f,h,64)
     reorderTwiddle(f,h,256)
     reorderTwiddle(f,h,1024)
     reorderTwiddle(f,h,4096)

     print(cfooter,file=f)
     print(hfooter,file=h)