Can I find a file which describes how to use C language to call assemble language in C64x+ device?

Hi Haitao,

The usage of asm code from a C program is more general and not only related to C64x+. Read the linked article and pay attention on the InputOperands description which gives you ability to read C expressions by the instructions in the AssemblerTemplate.
gcc.gnu.org/.../Extended-Asm.html

BR
Tsvetolin Shulev

 Shulev-XID：

        Thanks for your time and answer. As we know, different devices have different number of registers.  There are 64 registers which are divided into 2 parts named A-side and B-side. Is there a file which tells me which argumet map into which regster.

There is a C language function in file sum.c .

int dotp(short a[], short b[] )
{
    int sum, i;
    sum = 0;
    for(i=0; i<100; i++){
        sum += a[i] * b[i];
    }
    return(sum);
}

Now I am going to translate C code to assembly in sum.asm.

      MVK  .S1 100, A1 ; set up loop counter
   || ZERO .L1 A7 ; zero out accumulator
LOOP:
      LDH   .D1 *A4++,A2 ; load ai from memory
   || LDH   .D2 *B4++,B2 ; load bi from memory
      SUB  .S1 A1,1,A1 ; decrement loop counter
 [A1] B    .S2 LOOP ; branch to loop
      NOP        2 ; delay slots for LDH
      MPY  .M1X A2,B2,A6 ; ai * bi
      NOP           ; delay slots for MPY
      ADD .L1 A6,A7,A7 ; sum += (ai * bi)
      ; Branch occurs here

Now the problem is :

           How do I know the values of a and b will be mapped into the registers of A4 and B4 rather than others?

Shulev-XID,

There is a C language function in file sum.c .

int dotp(short a[], short b[] )
{
    int sum, i;
    sum = 0;
    for(i=0; i<100; i++){
        sum += a[i] * b[i];
    }
    return(sum);
}

Now I am going to translate C code to assembly in sum.asm.

      MVK  .S1 100, A1 ; set up loop counter
   || ZERO .L1 A7 ; zero out accumulator
LOOP:
      LDH   .D1 *A4++,A2 ; load ai from memory
   || LDH   .D2 *B4++,B2 ; load bi from memory
      SUB  .S1 A1,1,A1 ; decrement loop counter
 [A1] B    .S2 LOOP ; branch to loop
      NOP        2 ; delay slots for LDH
      MPY  .M1X A2,B2,A6 ; ai * bi
      NOP           ; delay slots for MPY
      ADD .L1 A6,A7,A7 ; sum += (ai * bi)
      ; Branch occurs here

Now the problem is :

           How do I know the values of a and b will be mapped into the registers of A4 and B4 rather than others?