Why are format strings showing blank values

HiFive1 Rev B
1

I am trying to print some values to stdout calling a “dump” function (part of a library I have made which gets linked at compile time)

void dump(tensor *t, int asfloat) {
  for (int j = 0; j < t->data_len; j++) {
    uint8_t d = ((uint8_t *)t->data)[j];
    printf("%x, ", d);
  }
}

Result:

, , , , , , , , , ,

Is this something to do with privilege level? Can I just run everything at maximum privilege for my tests?

2

The parentheses look a little strange to me; maybe try something like below? Also, declaring all variables first (at function scope) usually helps the compiler, a lot.

void dump(tensor *t, int asfloat) {
  uint8_t d;
  for (int j = 0; j < t->data_len; j++) {
    d = (uint8_t) ((t->data)[j]);
    printf("%x, ", d);
  }
}

You may also want to check the .lst file output to see exactly what is the code being generated; if not as desired, there might be a compiler option or optimization level that could help.

Nothing here nas anything to do with privilege level though, which is good.

3

Moving the parentheses changes the semantics in ways that may not be the original intent, depends what data_len is.

No it doesn’t.