Inline Assembly

From XCore Exchange

Example of Streaming Channel Inline Assembly functions

This is an example of a header (.h) file that allows interaction with streaming channels.

NOTE: The reason it is in a header file is that the compiler will not inline the function if it is used across modules. Putting it in a .h file gives the compiler every chance inline it!

#ifndef STREAMING_CHANS_H_
#define STREAMING_CHANS_H_

#include <xs1.h>
#include <xccompat.h>

#ifdef __XC__
inline static unsigned streaming_chan_inuint(streaming chanend c)
#else
inline static unsigned streaming_chan_inuint(chanend c)
#endif
{
  unsigned value;
  __asm__ __volatile__ (
    "in %0, res[%1]" :
    "=r"(value) :
    "r"(c)
  );
  return value;
}

#ifdef __XC__
inline static void streaming_chan_outuint(streaming chanend c, unsigned value)
#else
inline static void streaming_chan_outuint(chanend c, unsigned value)
#endif
{
  __asm__ __volatile__ (
    "out res[%0], %1" :
    /* no outputs */ :
    "r"(c), "r"(value)
  );
}

#ifdef __XC__
inline static unsigned char streaming_chan_inuchar(streaming chanend c)
#else
inline static unsigned char streaming_chan_inuchar(chanend c)
#endif
{
  unsigned value;
  __asm__ __volatile__ (
    "int %0, res[%1]" :
    "=r"(value) :
    "r"(c)
  );
  return value;
}

#ifdef __XC__
inline static void streaming_chan_outuchar(streaming chanend c, unsigned char value)
#else
inline static void streaming_chan_outuchar(chanend c, unsigned char value)
#endif
{
  __asm__ __volatile__ (
    "outt res[%0], %1" :
    /* no outputs */ :
    "r"(c), "r"(value)
  );
}




#endif /*STREAMING_CHANS_H_*/