Renesas / mbed-dsp-neon

Fork of mbed-dsp. CMSIS-DSP library of supporting NEON

Dependents:   mbed-os-example-cmsis_dsp_neon

Fork of mbed-dsp by mbed official

Information

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CMSIS-DSP of supporting NEON

What is this ?

A library for CMSIS-DSP of supporting NEON.
We supported the NEON to CMSIS-DSP Ver1.4.3(CMSIS V4.1) that ARM supplied, has achieved the processing speed improvement.
If you use the mbed-dsp library, you can use to replace this library.
CMSIS-DSP of supporting NEON is provied as a library.

Library Creation environment

CMSIS-DSP library of supporting NEON was created by the following environment.

  • Compiler
    ARMCC Version 5.03
  • Compile option switch[C Compiler]
   -DARM_MATH_MATRIX_CHECK -DARM_MATH_ROUNDING -O3 -Otime --cpu=Cortex-A9 --littleend --arm 
   --apcs=/interwork --no_unaligned_access --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp 
   --vectorize --asm
  • Compile option switch[Assembler]
   --cpreproc --cpu=Cortex-A9 --littleend --arm --apcs=/interwork --no_unaligned_access 
   --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp


Effects of NEON support

In the data which passes to each function, large size will be expected more effective than small size.
Also if the data is a multiple of 16, effect will be expected in every function in the CMSIS-DSP.


NEON対応CMSIS-DSP

概要

NEON対応したCMSIS-DSPのライブラリです。
ARM社提供のCMSIS-DSP Ver1.4.3(CMSIS V4.1)をターゲットにNEON対応を行ない、処理速度向上を実現しております。
mbed-dspライブラリを使用している場合は、本ライブラリに置き換えて使用することができます。
NEON対応したCMSIS-DSPはライブラリで提供します。

ライブラリ作成環境

NEON対応CMSIS-DSPライブラリは、以下の環境で作成しています。

  • コンパイラ
    ARMCC Version 5.03
  • コンパイルオプションスイッチ[C Compiler]
   -DARM_MATH_MATRIX_CHECK -DARM_MATH_ROUNDING -O3 -Otime --cpu=Cortex-A9 --littleend --arm 
   --apcs=/interwork --no_unaligned_access --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp 
   --vectorize --asm
  • コンパイルオプションスイッチ[Assembler]
   --cpreproc --cpu=Cortex-A9 --littleend --arm --apcs=/interwork --no_unaligned_access 
   --fpu=vfpv3_fp16 --fpmode=fast --apcs=/hardfp


NEON対応による効果について

CMSIS-DSP内の各関数へ渡すデータは、小さいサイズよりも大きいサイズの方が効果が見込めます。
また、16の倍数のデータであれば、CMSIS-DSP内のどの関数でも効果が見込めます。


Diff: cmsis_dsp/TransformFunctions/arm_rfft_q31.c

Revision:
2:da51fb522205
Parent:
1:fdd22bb7aa52
Child:
3:7a284390b0ce
--- a/cmsis_dsp/TransformFunctions/arm_rfft_q31.c	Wed Nov 28 12:30:09 2012 +0000
+++ b/cmsis_dsp/TransformFunctions/arm_rfft_q31.c	Thu May 30 17:10:11 2013 +0100
@@ -2,12 +2,12 @@
 * Copyright (C) 2010 ARM Limited. All rights reserved.    
 *    
 * $Date:        15. February 2012  
-* $Revision:     V1.1.0  
+* $Revision: 	V1.1.0  
 *    
-* Project:         CMSIS DSP Library    
-* Title:        arm_rfft_q31.c    
+* Project: 	    CMSIS DSP Library    
+* Title:	    arm_rfft_q31.c    
 *    
-* Description:    RFFT & RIFFT Q31 process function    
+* Description:	RFFT & RIFFT Q31 process function    
 *    
 *    
 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
@@ -37,7 +37,7 @@
 #include "arm_math.h"
 
 /*--------------------------------------------------------------------    
-*        Internal functions prototypes    
+*		Internal functions prototypes    
 --------------------------------------------------------------------*/
 
 void arm_split_rfft_q31(
@@ -134,12 +134,12 @@
 
 /**    
  * @brief  Core Real FFT process    
- * @param[in]   *pSrc                 points to the input buffer.    
- * @param[in]   fftLen              length of FFT.   
- * @param[in]   *pATable             points to the twiddle Coef A buffer.    
- * @param[in]   *pBTable             points to the twiddle Coef B buffer.    
- * @param[out]  *pDst                 points to the output buffer.    
- * @param[in]   modifier             twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.   
+ * @param[in]   *pSrc 				points to the input buffer.    
+ * @param[in]   fftLen  			length of FFT.   
+ * @param[in]   *pATable 			points to the twiddle Coef A buffer.    
+ * @param[in]   *pBTable 			points to the twiddle Coef B buffer.    
+ * @param[out]  *pDst 				points to the output buffer.    
+ * @param[in]   modifier 	        twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.   
  * @return none.    
  */
 
@@ -237,12 +237,12 @@
 
 /**    
  * @brief  Core Real IFFT process    
- * @param[in]   *pSrc                 points to the input buffer.   
- * @param[in]   fftLen              length of FFT.    
- * @param[in]   *pATable             points to the twiddle Coef A buffer.   
- * @param[in]   *pBTable             points to the twiddle Coef B buffer.    
- * @param[out]  *pDst                 points to the output buffer.   
- * @param[in]   modifier             twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.   
+ * @param[in]   *pSrc 				points to the input buffer.   
+ * @param[in]   fftLen  			length of FFT.    
+ * @param[in]   *pATable 			points to the twiddle Coef A buffer.   
+ * @param[in]   *pBTable 			points to the twiddle Coef B buffer.    
+ * @param[out]  *pDst 				points to the output buffer.   
+ * @param[in]   modifier 	        twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.   
  * @return none.    
  */