217 lines
5.2 KiB
ArmAsm
217 lines
5.2 KiB
ArmAsm
;/* ----------------------------------------------------------------------
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; * Project: CMSIS DSP Library
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; * Title: arm_bitreversal2.S
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; * Description: arm_bitreversal_32 function done in assembly for maximum speed.
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; * Called after doing an fft to reorder the output.
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; * The function is loop unrolled by 2. arm_bitreversal_16 as well.
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; *
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; * $Date: 18. March 2019
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; * $Revision: V1.5.2
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; *
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; * Target Processor: Cortex-M cores
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; * -------------------------------------------------------------------- */
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;/*
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; * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
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; *
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; * SPDX-License-Identifier: Apache-2.0
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; *
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; * Licensed under the Apache License, Version 2.0 (the License); you may
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; * not use this file except in compliance with the License.
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; * You may obtain a copy of the License at
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; *
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; * www.apache.org/licenses/LICENSE-2.0
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; *
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; * Unless required by applicable law or agreed to in writing, software
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; * distributed under the License is distributed on an AS IS BASIS, WITHOUT
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; * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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; * See the License for the specific language governing permissions and
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; * limitations under the License.
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; */
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#if defined ( __CC_ARM ) /* Keil */
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#define CODESECT AREA ||.text||, CODE, READONLY, ALIGN=2
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#define LABEL
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#elif defined ( __IASMARM__ ) /* IAR */
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#define CODESECT SECTION `.text`:CODE
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#define PROC
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#define LABEL
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#define ENDP
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#define EXPORT PUBLIC
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#elif defined ( __CSMC__ ) /* Cosmic */
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#define CODESECT switch .text
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#define THUMB
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#define EXPORT xdef
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#define PROC :
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#define LABEL :
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#define ENDP
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#define arm_bitreversal_32 _arm_bitreversal_32
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#elif defined ( __TI_ARM__ ) /* TI ARM */
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#define THUMB .thumb
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#define CODESECT .text
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#define EXPORT .global
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#define PROC : .asmfunc
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#define LABEL :
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#define ENDP .endasmfunc
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#define END
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#elif defined ( __GNUC__ ) /* GCC */
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#define THUMB .thumb
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#define CODESECT .section .text
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#define EXPORT .global
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#define PROC :
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#define LABEL :
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#define ENDP
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#define END
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.syntax unified
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#endif
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CODESECT
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THUMB
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;/**
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; @brief In-place bit reversal function.
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; @param[in,out] pSrc points to the in-place buffer of unknown 32-bit data type
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; @param[in] bitRevLen bit reversal table length
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; @param[in] pBitRevTab points to bit reversal table
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; @return none
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; */
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EXPORT arm_bitreversal_32
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EXPORT arm_bitreversal_16
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#if defined ( __CC_ARM ) /* Keil */
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#elif defined ( __IASMARM__ ) /* IAR */
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#elif defined ( __CSMC__ ) /* Cosmic */
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#elif defined ( __TI_ARM__ ) /* TI ARM */
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#elif defined ( __GNUC__ ) /* GCC */
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.type arm_bitreversal_16, %function
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.type arm_bitreversal_32, %function
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#endif
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#if defined (ARM_MATH_CM0_FAMILY)
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arm_bitreversal_32 PROC
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ADDS r3,r1,#1
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PUSH {r4-r6}
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ADDS r1,r2,#0
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LSRS r3,r3,#1
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arm_bitreversal_32_0 LABEL
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LDRH r2,[r1,#2]
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LDRH r6,[r1,#0]
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ADD r2,r0,r2
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ADD r6,r0,r6
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LDR r5,[r2,#0]
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LDR r4,[r6,#0]
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STR r5,[r6,#0]
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STR r4,[r2,#0]
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LDR r5,[r2,#4]
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LDR r4,[r6,#4]
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STR r5,[r6,#4]
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STR r4,[r2,#4]
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ADDS r1,r1,#4
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SUBS r3,r3,#1
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BNE arm_bitreversal_32_0
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POP {r4-r6}
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BX lr
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ENDP
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arm_bitreversal_16 PROC
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ADDS r3,r1,#1
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PUSH {r4-r6}
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ADDS r1,r2,#0
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LSRS r3,r3,#1
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arm_bitreversal_16_0 LABEL
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LDRH r2,[r1,#2]
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LDRH r6,[r1,#0]
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LSRS r2,r2,#1
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LSRS r6,r6,#1
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ADD r2,r0,r2
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ADD r6,r0,r6
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LDR r5,[r2,#0]
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LDR r4,[r6,#0]
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STR r5,[r6,#0]
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STR r4,[r2,#0]
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ADDS r1,r1,#4
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SUBS r3,r3,#1
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BNE arm_bitreversal_16_0
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POP {r4-r6}
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BX lr
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ENDP
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#else
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arm_bitreversal_32 PROC
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ADDS r3,r1,#1
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CMP r3,#1
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IT LS
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BXLS lr
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PUSH {r4-r9}
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ADDS r1,r2,#2
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LSRS r3,r3,#2
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arm_bitreversal_32_0 LABEL ;/* loop unrolled by 2 */
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LDRH r8,[r1,#4]
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LDRH r9,[r1,#2]
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LDRH r2,[r1,#0]
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LDRH r12,[r1,#-2]
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ADD r8,r0,r8
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ADD r9,r0,r9
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ADD r2,r0,r2
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ADD r12,r0,r12
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LDR r7,[r9,#0]
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LDR r6,[r8,#0]
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LDR r5,[r2,#0]
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LDR r4,[r12,#0]
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STR r6,[r9,#0]
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STR r7,[r8,#0]
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STR r5,[r12,#0]
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STR r4,[r2,#0]
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LDR r7,[r9,#4]
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LDR r6,[r8,#4]
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LDR r5,[r2,#4]
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LDR r4,[r12,#4]
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STR r6,[r9,#4]
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STR r7,[r8,#4]
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STR r5,[r12,#4]
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STR r4,[r2,#4]
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ADDS r1,r1,#8
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SUBS r3,r3,#1
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BNE arm_bitreversal_32_0
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POP {r4-r9}
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BX lr
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ENDP
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arm_bitreversal_16 PROC
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ADDS r3,r1,#1
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CMP r3,#1
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IT LS
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BXLS lr
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PUSH {r4-r9}
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ADDS r1,r2,#2
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LSRS r3,r3,#2
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arm_bitreversal_16_0 LABEL ;/* loop unrolled by 2 */
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LDRH r8,[r1,#4]
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LDRH r9,[r1,#2]
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LDRH r2,[r1,#0]
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LDRH r12,[r1,#-2]
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ADD r8,r0,r8,LSR #1
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ADD r9,r0,r9,LSR #1
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ADD r2,r0,r2,LSR #1
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ADD r12,r0,r12,LSR #1
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LDR r7,[r9,#0]
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LDR r6,[r8,#0]
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LDR r5,[r2,#0]
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LDR r4,[r12,#0]
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STR r6,[r9,#0]
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STR r7,[r8,#0]
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STR r5,[r12,#0]
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STR r4,[r2,#0]
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ADDS r1,r1,#8
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SUBS r3,r3,#1
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BNE arm_bitreversal_16_0
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POP {r4-r9}
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BX lr
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ENDP
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#endif
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END
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