Re: FLoating value from native

Thanks a lot Shawn and Thomas !

yes, I got it.  By returning int from native we have to just call
Float.intBitsToFloat() to get the float value from 32bit IEEE754 format.

Here is a sample java class and a native method.


public class FloatRetMath
{
  // static method with parameters float and return type int

  public static native int processFloat(float f);

  public static void main(String[] args)
  {

  System.loadLibrary("FloatRetMath.tlib");
  // attempt to load our native library
 float f = 5.0f;

    try
    {

     System.out.println("Through Native call passing float " + f );
     int k = processFloat(f);
      System.out.println("Processed Result in integer format is (IEEE754) "
+ k);
      System.out.println("Processed Result in float is " +
Float.intBitsToFloat(k));

    }
    catch(Throwable t)
    {
      System.out.println(t);
    }

    System.out.println("Exiting FloatRetMath");
  }
}


;***************************************************************************
*
Native_processFloat:
  clr    a                       ; request first parameter
  lcall  NatLib_LoadPrimitive    ; point to parameter
;
; we just popped the param into
; R3:R0 - let's just return them
; as the result




  clr  a                         ; indicate "no exception"
  ret                            ;
;*************************************************************

-----Original Message-----
From: Thomas Chenot <tom.chenot-6tN4nzCoH/[email protected]>
To: sharmila inamdar <[email protected]>
Cc: tini <tini-6tN4nzCoH/[email protected]>
Date: Wednesday, March 31, 2004 9:35 PM
Subject: Re: [TINI]FLoating value from native


>sharmila inamdar wrote:
>
>>I am using DS80c390. I want to know whether we can get direct floating
point
>>value form native layer ? How should it be returned in native and which
>>format?
>>
>There is no support for floating point in the native API. The basics
>(+,-,*,/, SQRT) are handled via the JVM. The rest is handled at the
>library level. The format is described in IEEE Std 754-1985. Single
>precision values are 32 bits and are therefore passed in and returned
>just as "int" values are passed and returned. Double precision values
>are 64 bits and therefore are handled in the same manner as "long" values.
>
>>
>>The native example given with the TSDK talks about long and int return
>>values. How do I handle float values ? Or I have to return a byte array
and
>>then process it on the JVM layer?
>>
>>
>>..sharmila
>>
>>
>>
>--
>Thomas Chenot
>

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