The CMSIS DSP 5 library
Dependents: Nucleo-Heart-Rate ejercicioVrms2 PROYECTOFINAL ejercicioVrms ... more
functions/TransformFunctions/arm_bitreversal2.S
- Committer:
- xorjoep
- Date:
- 2018-06-21
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
File content as of revision 3:4098b9d3d571:
;/* ---------------------------------------------------------------------- ; * Project: CMSIS DSP Library ; * Title: arm_bitreversal2.S ; * Description: arm_bitreversal_32 function done in assembly for maximum speed. ; * Called after doing an fft to reorder the output. ; * The function is loop unrolled by 2. arm_bitreversal_16 as well. ; * ; * $Date: 27. January 2017 ; * $Revision: V.1.5.1 ; * ; * Target Processor: Cortex-M cores ; * -------------------------------------------------------------------- */ ;/* ; * Copyright (C) 2010-2017 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. ; */ #if defined ( __CC_ARM ) /* Keil */ #define CODESECT AREA ||.text||, CODE, READONLY, ALIGN=2 #define LABEL #elif defined ( __IASMARM__ ) /* IAR */ #define CODESECT SECTION `.text`:CODE #define PROC #define LABEL #define ENDP #define EXPORT PUBLIC #elif defined ( __CSMC__ ) /* Cosmic */ #define CODESECT switch .text #define THUMB #define EXPORT xdef #define PROC : #define LABEL : #define ENDP #define arm_bitreversal_32 _arm_bitreversal_32 #elif defined ( __TI_ARM__ ) /* TI ARM */ #define THUMB .thumb #define CODESECT .text #define EXPORT .global #define PROC : .asmfunc #define LABEL : #define ENDP .endasmfunc #define END #elif defined ( __GNUC__ ) /* GCC */ #define THUMB .thumb #define CODESECT .section .text #define EXPORT .global #define PROC : #define LABEL : #define ENDP #define END .syntax unified #endif CODESECT THUMB ;/* ;* @brief In-place bit reversal function. ;* @param[in, out] *pSrc points to the in-place buffer of unknown 32-bit data type. ;* @param[in] bitRevLen bit reversal table length ;* @param[in] *pBitRevTab points to bit reversal table. ;* @return none. ;*/ EXPORT arm_bitreversal_32 EXPORT arm_bitreversal_16 #if defined ( __CC_ARM ) /* Keil */ #elif defined ( __IASMARM__ ) /* IAR */ #elif defined ( __CSMC__ ) /* Cosmic */ #elif defined ( __TI_ARM__ ) /* TI ARM */ #elif defined ( __GNUC__ ) /* GCC */ .type arm_bitreversal_16, %function .type arm_bitreversal_32, %function #endif #if defined(ARM_MATH_CM0) || defined(ARM_MATH_CM0PLUS) || defined(ARM_MATH_ARMV8MBL) arm_bitreversal_32 PROC ADDS r3,r1,#1 PUSH {r4-r6} ADDS r1,r2,#0 LSRS r3,r3,#1 arm_bitreversal_32_0 LABEL LDRH r2,[r1,#2] LDRH r6,[r1,#0] ADD r2,r0,r2 ADD r6,r0,r6 LDR r5,[r2,#0] LDR r4,[r6,#0] STR r5,[r6,#0] STR r4,[r2,#0] LDR r5,[r2,#4] LDR r4,[r6,#4] STR r5,[r6,#4] STR r4,[r2,#4] ADDS r1,r1,#4 SUBS r3,r3,#1 BNE arm_bitreversal_32_0 POP {r4-r6} BX lr ENDP arm_bitreversal_16 PROC ADDS r3,r1,#1 PUSH {r4-r6} ADDS r1,r2,#0 LSRS r3,r3,#1 arm_bitreversal_16_0 LABEL LDRH r2,[r1,#2] LDRH r6,[r1,#0] LSRS r2,r2,#1 LSRS r6,r6,#1 ADD r2,r0,r2 ADD r6,r0,r6 LDR r5,[r2,#0] LDR r4,[r6,#0] STR r5,[r6,#0] STR r4,[r2,#0] ADDS r1,r1,#4 SUBS r3,r3,#1 BNE arm_bitreversal_16_0 POP {r4-r6} BX lr ENDP #else arm_bitreversal_32 PROC ADDS r3,r1,#1 CMP r3,#1 IT LS BXLS lr PUSH {r4-r9} ADDS r1,r2,#2 LSRS r3,r3,#2 arm_bitreversal_32_0 LABEL ;/* loop unrolled by 2 */ LDRH r8,[r1,#4] LDRH r9,[r1,#2] LDRH r2,[r1,#0] LDRH r12,[r1,#-2] ADD r8,r0,r8 ADD r9,r0,r9 ADD r2,r0,r2 ADD r12,r0,r12 LDR r7,[r9,#0] LDR r6,[r8,#0] LDR r5,[r2,#0] LDR r4,[r12,#0] STR r6,[r9,#0] STR r7,[r8,#0] STR r5,[r12,#0] STR r4,[r2,#0] LDR r7,[r9,#4] LDR r6,[r8,#4] LDR r5,[r2,#4] LDR r4,[r12,#4] STR r6,[r9,#4] STR r7,[r8,#4] STR r5,[r12,#4] STR r4,[r2,#4] ADDS r1,r1,#8 SUBS r3,r3,#1 BNE arm_bitreversal_32_0 POP {r4-r9} BX lr ENDP arm_bitreversal_16 PROC ADDS r3,r1,#1 CMP r3,#1 IT LS BXLS lr PUSH {r4-r9} ADDS r1,r2,#2 LSRS r3,r3,#2 arm_bitreversal_16_0 LABEL ;/* loop unrolled by 2 */ LDRH r8,[r1,#4] LDRH r9,[r1,#2] LDRH r2,[r1,#0] LDRH r12,[r1,#-2] ADD r8,r0,r8,LSR #1 ADD r9,r0,r9,LSR #1 ADD r2,r0,r2,LSR #1 ADD r12,r0,r12,LSR #1 LDR r7,[r9,#0] LDR r6,[r8,#0] LDR r5,[r2,#0] LDR r4,[r12,#0] STR r6,[r9,#0] STR r7,[r8,#0] STR r5,[r12,#0] STR r4,[r2,#0] ADDS r1,r1,#8 SUBS r3,r3,#1 BNE arm_bitreversal_16_0 POP {r4-r9} BX lr ENDP #endif END