usr/src/sys/tahoe/align/Asub3.c

/*      Asub3.c 1.1     86/07/20        */

#include "../tahoealign/align.h"
sub3(infop)     process_info *infop;
/*
/*      Subtract , 3 operands.
/*
/*****************************************/
{

        register        long    Register_12;    /* Has to be first reg ! */
        register        long    data0, data1, result;

        data0 = operand(infop,0)->data;
        data1 = operand(infop,1)->data;
        Register_12=psl;
        Set_psl(r12);   /* restore the user psl */
        result = data1 - data0;         /* 32 bits of true result */
        asm ("  movpsl  r12");
        New_cc (Register_12);
        write_back (infop,result, operand(infop,2) );
}