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[/] [forwardcom/] [examples/] [integrate.as] - Blame information for rev 168

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1 128 Agner
/***************************  integrate.as  ***********************************
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* Author:        Agner Fog
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* date created:  2018-02-30
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* Version:       1.00
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* Project:       ForwardCom example, assembly code
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* Description:   Numerical integration of sin(x) from 0 to pi/2
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*
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* Link with libraries libc.li and math.li
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*
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* Copyright 2018 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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// define parameters. you may change these
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% npoints = 8                          // number of function points to calculate. must be a power of 2
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% M_PI = 3.14159265358979323846        // pi
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% startvalue = 0                       // start of x interval
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% endvalue = M_PI / 2                  // end of x interval
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const section read ip                  // read-only data section
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// format string for printf
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form: int8 "\nNumerical integration of sin(x) from %f to %f "
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      int8 "with %i function points."
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      int8 "\nThe result is %.15f\n",0
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const end
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bss section datap uninitialized        // uninitialized read/write data section
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int64 parlist[8]                       // parameter list for printf
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bss end
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code section execute align = 4         // code section
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extern _sin: function                  // library function: sine in radians
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extern _integrate: function            // library function: numerical integration
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extern _printf: function               // library function: formatted output to stdout
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_main function public                  // program begins here
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double v0 = startvalue                 // x interval start
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double v1 = endvalue                   // x interval end
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int64  r0 = address([_sin])            // function pointer
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int64  r1 = npoints                    // number of x points
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call _integrate                        // integrate sin(x)
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// print results
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int64  r0 = address([form])            // format string for printf
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int64  r1 = address([parlist])         // parameter list for printf
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double v1 = startvalue                 // parameters
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double v2 = endvalue
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int32+ r2 = npoints
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double [r1,    scalar] = v1            // put parameters into variable argument list for printf
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double [r1+8,  scalar] = v2
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int64  [r1+16        ] = r2
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double [r1+24, scalar] = v0
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call _printf                           // print results
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int64 r0 = 0                           // program return value
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return                                 // return from main
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_main end
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code end

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