Renesas
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
Japanese version is available in lower part of this page.
このページの後半に日本語版が用意されています．
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/StatisticsFunctions/arm_min_q7.c
- Revision:
- 1:fdd22bb7aa52
- Child:
- 2:da51fb522205
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/cmsis_dsp/StatisticsFunctions/arm_min_q7.c Wed Nov 28 12:30:09 2012 +0000
@@ -0,0 +1,170 @@
+/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_min_q7.c
+*
+* Description: Minimum value of a Q7 vector.
+*
+* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
+*
+* Version 1.1.0 2012/02/15
+* Updated with more optimizations, bug fixes and minor API changes.
+*
+* Version 1.0.10 2011/7/15
+* Big Endian support added and Merged M0 and M3/M4 Source code.
+*
+* Version 1.0.3 2010/11/29
+* Re-organized the CMSIS folders and updated documentation.
+*
+* Version 1.0.2 2010/11/11
+* Documentation updated.
+*
+* Version 1.0.1 2010/10/05
+* Production release and review comments incorporated.
+*
+* Version 1.0.0 2010/09/20
+* Production release and review comments incorporated.
+* ---------------------------------------------------------------------------- */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupStats
+ */
+
+/**
+ * @addtogroup Min
+ * @{
+ */
+
+
+/**
+ * @brief Minimum value of a Q7 vector.
+ * @param[in] *pSrc points to the input vector
+ * @param[in] blockSize length of the input vector
+ * @param[out] *pResult minimum value returned here
+ * @param[out] *pIndex index of minimum value returned here
+ * @return none.
+ *
+ */
+
+void arm_min_q7(
+ q7_t * pSrc,
+ uint32_t blockSize,
+ q7_t * pResult,
+ uint32_t * pIndex)
+{
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+
+ q7_t minVal1, minVal2, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex, count; /* loop counter */
+
+ /* Initialise the count value. */
+ count = 0u;
+ /* Initialise the index value to zero. */
+ outIndex = 0u;
+ /* Load first input value that act as reference value for comparision */
+ out = *pSrc++;
+
+ /* Loop unrolling */
+ blkCnt = (blockSize - 1u) >> 2u;
+
+ while(blkCnt > 0)
+ {
+ /* Initialize minVal to the next consecutive values one by one */
+ minVal1 = *pSrc++;
+ minVal2 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal1)
+ {
+ /* Update the minimum value and its index */
+ out = minVal1;
+ outIndex = count + 1u;
+ }
+
+ minVal1 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal2)
+ {
+ /* Update the minimum value and its index */
+ out = minVal2;
+ outIndex = count + 2u;
+ }
+
+ minVal2 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal1)
+ {
+ /* Update the minimum value and its index */
+ out = minVal1;
+ outIndex = count + 3u;
+ }
+
+ /* compare for the minimum value */
+ if(out > minVal2)
+ {
+ /* Update the minimum value and its index */
+ out = minVal2;
+ outIndex = count + 4u;
+ }
+
+ count += 4u;
+
+ blkCnt--;
+ }
+
+ /* if (blockSize - 1u ) is not multiple of 4 */
+ blkCnt = (blockSize - 1u) % 4u;
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+
+ q7_t minVal1, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex; /* loop counter */
+
+ /* Initialise the index value to zero. */
+ outIndex = 0u;
+ /* Load first input value that act as reference value for comparision */
+ out = *pSrc++;
+
+ blkCnt = (blockSize - 1u);
+
+#endif // #ifndef ARM_MATH_CM0
+
+ while(blkCnt > 0)
+ {
+ /* Initialize minVal to the next consecutive values one by one */
+ minVal1 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal1)
+ {
+ /* Update the minimum value and it's index */
+ out = minVal1;
+ outIndex = blockSize - blkCnt;
+ }
+
+ blkCnt--;
+
+ }
+
+ /* Store the minimum value and its index into destination pointers */
+ *pResult = out;
+ *pIndex = outIndex;
+
+
+}
+
+/**
+ * @} end of Min group
+ */