//--------------------------------------------------------------------------
//
//  Software for MSP430 based e-meters.
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//
//  File: accum48.c
//
//  Steve Underwood <steve-underwood@ti.com>
//  Texas Instruments Hong Kong Ltd.
//
//  $Id: accum48.c,v 1.3 2005/07/13 09:40:57 a0754793 Exp $
//
//--------------------------------------------------------------------------
#include <stdint.h>
#include "emeter-toolkit-custom.h"
#include "emeter-toolkit.h"

#if defined(__IAR_SYSTEMS_ICC__)
void accum48(register int16_t x[3], register int32_t y)
{
    /* Accumulate a 32 bit integer value into a 48 bit one represented
       by a 3 element int16_t array */
#if defined(__MSP430__)
#if defined(__GNUC__)
    register int16_t y_ex;

    __asm__ __volatile__ (
        " mov   %B[y],%[y_ex] \n"
        " rla   %[y_ex] \n"
        " subc  %[y_ex],%[y_ex] \n"
        " inv   %[y_ex] \n"
        " add   %A[y],0(%[x]) \n"
        " addc  %B[y],2(%[x]) \n"
        " addc  %[y_ex],4(%[x]) \n"
        : 
        : [x] "r"(x), [y] "r"(y), [y_ex] "r"(y_ex));
#elif defined(__AQCOMPILER__)
    register int16_t y_ex;

    /$
        mov     @y.0,@y_ex
        rla     @y_ex
        subc    @y_ex,@y_ex
        inv     @y_ex
        add     @y.1,0(@x)
        addc    @y.0,2(@x)
        addc    @y_ex,4(@x)
    $/
#elif defined(__IAR_SYSTEMS_ICC__)
    int64_t acc;

    acc = (uint16_t) x[2];
    acc <<= 16;
    acc |= (uint16_t) x[1];
    acc <<= 16;
    acc |= (uint16_t) x[0];
    acc += y;
    x[0] = acc;
    acc >>= 16;
    x[1] = acc;
    acc >>= 16;
    x[2] = acc;
#else
#error "Don't know how to accum48"
#endif
#else
    int64_t acc;

    acc = (uint16_t) x[2];
    acc <<= 16;
    acc |= (uint16_t) x[1];
    acc <<= 16;
    acc |= (uint16_t) x[0];
    acc += y;
    x[0] = acc;
    acc >>= 16;
    x[1] = acc;
    acc >>= 16;
    x[2] = acc;
#endif
}
#endif