riscv-gcc problem

[wizard]

Greetings,

I tried to add a new assembly instruction to riscv-gcc, the new instruction is: "checki rdi,rs1,rs2".I want riscv-gcc to insert my assembly statement before the array's assignment statement during compilation.

 

For example:

int func1()
{
    int a[10];
    int b[10];
    a[0] = 1;
}

int func2()
{
    int a[10];
    int b[10];
    ...
    ...
    a[2] = b[3];
}


I want riscv-gcc to compile the above code to do the following:

int fun1(){    int a[10];
    int b[10];
    <----------- checki rdi,rs1,rs2 
    // insert my custom assembly code
    a[0] = 1;
}

int func2()
{
    int a[10];
    int b[10];
    ...
    ...
    <----------- checki rdi,rs1,rs2 
    // insert my custom assembly code
    a[2] = b[3];
}

 

What I have done before:

I added a new custom instruction(checki rdi,rs1,rs2) in RISC-V Toolchain and simulated it sucessesfully. I wrote a test sample and compiled it successfully with riscv-gcc:

#include <stdio.h>

int main(){
  int a,b,c;
  a = 5;
  b = 2;
  asm volatile
  (
    "checki   %[z], %[x], %[y]\n\t"
    : [z] "=r" (c)
    : [x] "r" (a), [y] "r" (b)
  )  
 
  if ( c != 1 ){
     printf("\n[[FAILED]]\n");
     return -1;
  }
  
  printf("\n[[PASSED]]\n");

  return 0;
}

What steps should I follow to complete my work and what materials can I refer to?

Thanks in advance.