ARM C嵌套汇编&NEON运算小例子

来源：互联网发布：模锻力计算模拟软件编辑：程序博客网时间：2024/05/02 03:04
#include <stdio.h>#include <stdlib.h>#include <arm_neon.h>int main(){int x[10]={0};int *x_value;x_value=x;int data;asm("str fp, [sp, #-4]! \n\t""addfp, sp, #0   \n\t"                /*1-8*/"mov r3, #1   \n\t""strb r3, [fp, #-48]      \n\t""mov r3,#2 \n\t""strb r3, [fp, #-47]      \n\t""mov r3, #3   \n\t""strb r3, [fp, #-46]      \n\t""mov r3,#4 \n\t""strb r3,[fp,#-45]  \n\t""mov r3, #5   \n\t""strb r3, [fp, #-44]      \n\t""mov r3,#6 \n\t""strb r3,[fp,#-43]  \n\t""mov r3,#7 \n\t""strb r3,[fp,#-42]  \n\t""mov r3,#8 \n\t""strb r3,[fp,#-41]  \n\t"/*9-16*/"mov r3, #9   \n\t""strb r3, [fp, #-40]      \n\t""mov r3,#10 \n\t""strb r3, [fp, #-39]      \n\t""mov r3, #11   \n\t""strb r3, [fp, #-38]      \n\t""mov r3,#12 \n\t""strb r3,[fp,#-37]  \n\t""mov r3, #13   \n\t""strb r3, [fp, #-36]      \n\t""mov r3,#14 \n\t""strb r3,[fp,#-35]  \n\t""mov r3,#14 \n\t""strb r3,[fp,#-34]  \n\t""mov r3,#16 \n\t""strb r3,[fp,#-33]  \n\t""    sub r3, fp,#48 \n\t"//back to [fp,#-48]"vld1.8 {d16},[r3]  \n\t"//load to neon register,"    sub r3,fp, #40 \n\t"//back to [fp,#32]"vld1.8 {d17},[r3]  \n\t" //load to neon register,"vadd.i8 d0,d16,d17  \n\t"     "    sub r3, fp,#200 \n\t""vst1.8 {d0}, [r3]  \n\t""    ldrb r3,[fp,#-200]   \n\t""    str r3,[%[x],#0]  \n\t""    ldrb r3,[fp,#-199]   \n\t""    str r3,[%[x],#4]  \n\t""    ldrb r3,[fp,#-198]  \n\t""    str r3,[%[x],#8]  \n\t""    ldrb r3,[fp,#-197]   \n\t""    str r3,[%[x],#12]  \n\t""    ldrb r3,[fp,#-196]   \n\t""    str r3,[%[x],#16]  \n\t""    ldrb r3,[fp,#-195]   \n\t""    str r3,[%[x],#20]  \n\t""    ldrb r3,[fp,#-194]  \n\t""    str r3,[%[x],#24]  \n\t""    ldrb r3,[fp,#-193]   \n\t""    str r3,[%[x],#28]  \n\t""mov %[data],r3 \n\t""ldrfp, [sp], #4   \n\t":[x]"+r"(x_value),[data]"+r"(data)::"r0","r3","memory");int i;for(i=0;i<10;i++)printf("%d:%d-%d\n",i,x[i],data);return 0;}
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