一个适用于TI ARM与DSP双核平台的makefile。该makefile示意了如何同时编译出ARM平台和DSP平台的执行文件，以便于比较ARM核和DSP核在进行运算时表现出来的性能差异。 makefile ############################################################################# # Makefile # # # # Builds the emqbit benchmark source for ARM and DSP # ############################################################################# # # ############################################################################# # # # Copyright (C) 2010 Texas Instruments Incorporated # # http://www.ti.com/ # # # ############################################################################# # # ############################################################################# # # # Redistribution and use in source and binary forms, with or without # # modification, are permitted provided that the following conditions # # are met: # # # # Redistributions of source code must retain the above copyright # # notice, this list of conditions and the following disclaimer. # # # # Redistributions in binary form must reproduce the above copyright # # notice, this list of conditions and the following disclaimer in the # # documentation and/or other materials provided with the # # distribution. # # # # Neither the name of Texas Instruments Incorporated nor the names of # # its contributors may be used to endorse or promote products derived # # from this software without specific prior written permission. # # # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT # # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR # # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT # # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, # # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT # # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # # # ############################################################################# PROJNAME := matmult # ---------------------------------------------------------------------------- # Name of the ARM GCC cross compiler # ---------------------------------------------------------------------------- ARM_TOOLCHAIN_PREFIX ?= arm-none-linux-gnueabi- ifdef ARM_TOOLCHAIN_PATH ARM_CC := $(ARM_TOOLCHAIN_PATH)/bin/$(ARM_TOOLCHAIN_PREFIX)gcc else ARM_CC := $(ARM_TOOLCHAIN_PREFIX)gcc endif # Pick up any ARM compiler and linker flags from the environment ARM_CFLAGS = $(CFLAGS) ARM_CFLAGS += -std=gnu99 -Wdeclaration-after-statement -Wall -Wno-trigraphs -fno-strict-aliasing -fno-common -fno-omit-frame-pointer -c -O3 ARM_LDFLAGS = $(LDFLAGS) ARM_LDFLAGS+=-lm # ---------------------------------------------------------------------------- # Name of the DSP compiler # TI C6RunApp Frontend (if path variable provided, use it, otherwise assume # the tools are in the path) # ---------------------------------------------------------------------------- C6RUN_TOOLCHAIN_PREFIX=c6runapp- ifdef C6RUN_TOOLCHAIN_PATH C6RUN_CC := $(C6RUN_TOOLCHAIN_PATH)/bin/$(C6RUN_TOOLCHAIN_PREFIX)cc else C6RUN_CC := $(C6RUN_TOOLCHAIN_PREFIX)cc endif DSPLIB_PATH := $(HOME)/C64x+DSPLIB/dsplib_v210 C6RUN_CFLAGS = -c -O3 -I$(DSPLIB_PATH) -DUSE_DSPLIB C6RUN_LDFLAGS= # ---------------------------------------------------------------------------- # List of source files # ---------------------------------------------------------------------------- SRCS := $(PROJNAME).c ARM_OBJS := $(SRCS:%.c=gpp/%.o) DSP_OBJS := $(SRCS:%.c=dsp/%.o) # ---------------------------------------------------------------------------- # Makefile targets # ---------------------------------------------------------------------------- .PHONY : dsp dsp_clean gpp gpp_clean all clean all: dsp gpp clean: dsp_clean gpp_clean gpp: gpp/.created $(ARM_OBJS) $(ARM_CC) $(ARM_LDFLAGS) -o $(PROJNAME)_gpp $(ARM_OBJS) gpp/%.o : %.c $(ARM_CC) $(ARM_CFLAGS) $(CINCLUDES) -o $@ $< gpp/.created: @mkdir -p gpp @touch gpp/.created gpp_clean: @rm -Rf $(PROJNAME)_gpp @rm -Rf gpp dsp: dsp/.created $(DSP_OBJS) $(C6RUN_CC) $(C6RUN_LDFLAGS) -o $(PROJNAME)_dsp $(DSP_OBJS) $(DSPLIB_PATH)/dsplib64plus.lib dsp/%.o : %.c $(C6RUN_CC) $(C6RUN_CFLAGS) $(CINCLUDES) -o $@ $< dsp/.created: @mkdir -p dsp @touch dsp/.created dsp_clean: @rm -Rf $(PROJNAME)_dsp @rm -Rf dsp
源文件： matmult.c #include #include #include #ifdef USE_DSPLIB #include "src/DSP_mat_mul/DSP_mat_mul.h" #endif // Random matrix fill void matfill(int size, short *mat) { int i, j; for (i = 0; i < size; i++) { for (j = 0; j < size; j++) { mat[j+size*i] = (short) (rand() % 100); } } } void printmat(int size, short *mat) { } // Matrix multiply using Fixed point C64x+ DSPLib function void matmult(int size, int shift, short *A, short *B, short *C) { #ifdef USE_DSPLIB DSP_mat_mul( A,size,size, B, size, C, shift ); #else int i, j, k; int sum; for (i = 0; i < size; i++) { for (j = 0; j < size; j++) { sum = 0; for (k = 0; k < size; k++) { sum += (A[i*size + k] * B[k*size + j]); } C[i*size + j] = sum >> shift; } } #endif } //square matrices only int main(int argc, char *argv[]) { short *A, *B, *C; int matsize, shift; time_t t; if (argc != 2) exit(-1); matsize = atoi(argv[1]); shift = 0; while ((matsize>>shift) > 0) { ++shift; } srand(time(NULL)); if (matsize == 0) exit(-1); // Allocate space for matrices A = calloc(matsize*matsize, sizeof(short)); matfill(matsize, A); B = calloc(matsize*matsize, sizeof(short)); matfill(matsize, B); C = calloc(matsize*matsize, sizeof(short)); // Perform multiply and time it t = time(NULL); matmult(matsize, shift, A, B, C); t = time(NULL) - t; printf("time of multiply: %d seconds ",(int)t); // Free allocated spaces free(A); free(B); free(C); }
运行结果： root@dm37x-evm:/opt# for i in 100 200 300 400 500 600; do ./matmult_gpp $i; done time of multiply: 0 seconds time of multiply: 0 seconds time of multiply: 2 seconds time of multiply: 6 seconds time of multiply: 18 seconds time of multiply: 39 seconds root@dm37x-evm:/opt# for i in 100 200 300 400 500 600; do ./matmult_dsp $i; done time of multiply: 0 seconds time of multiply: 0 seconds time of multiply: 0 seconds time of multiply: 0 seconds time of multiply: 1 seconds time of multiply: 3 seconds 可见当数据量大时，DSP表现出来的性能优越性更明显。