Cannot divide 64-bit values in Platin

[Emoun]

Trying to divide uint64_t will result in Platin complaining there is an unbounded loop.

Example program:

#include <stdio.h> 
#include <stdint.h>
#include <inttypes.h>

uint32_t test_fn (uint32_t x, uint32_t y)  __attribute__ ((noinline));

int main () {
	uint32_t x, y;
	scanf("%" SCNd32 "\n", &x);
	scanf("%" SCNd32 "\n", &y);
	printf("%d\n", (int) test_fn(x, y));
	return 0;
}

uint32_t test_fn (uint32_t x, uint32_t y) {
	return x / y;
}

Trying to analyze the resulting binary for WCET of test_fn will make Platin complain.

Looking into compiler-rt, I see that there is a dedicated function for 32-bit division in the Patmos builtins, but not for 64-bit.
This means the default one is used, which of-course doesn't include loop bounds.

Solution is to implement 64-bit division for Patmos in compile-rt such that it works out of the box.