Make your life simple: 

sub MyFunc {
    my $arrRef= shift(@_);
    my $packedArr= pack("f*",@$arrRef);
    return MyFuncC( 0+@$arrRef, $packedArr );
}

[download]
write in Perl what is easy to do in Perl and write in C only what is easy to write in C. Then you can declare your XS code like: 
int MyFuncC( count, packedArray )
        int    count;
        char * packedArray;
    CODE:
        RETVAL= CFunc( count, (float *)packedArray );

[download]
Note that this changes depending on the data type of the array to be used by the C function. Provide more details if you have questions.

Updated to work for floats.

        - tye (but my friends call me "Tye")

In reply to (tye)Re: Passing References to Arrays into Perl Extensions in C by tye
in thread Passing References to Arrays into Perl Extensions in C by Evanovich

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