C:\test>type _Inline\build\_1159002\_1159002.xs
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "INLINE.h"

#define IS_VARS Inline_Stack_Vars
#define IS_RESET Inline_Stack_Reset
#define IS_ITEMS Inline_Stack_Items
#define IS_ITEM( n ) Inline_Stack_Item( n )
#define IS_PUSHS( s )   Inline_Stack_Push( sv_2mortal( s ) )
#define IS_PUSHIV( iv ) Inline_Stack_Push( sv_2mortal( newSViv( iv ) ) )
#define IS_PUSHUV( uv ) Inline_Stack_Push( sv_2mortal( newSVuv( uv ) ) )
#define IS_PUSHNV( nv ) Inline_Stack_Push( sv_2mortal( newSVnv( nv ) ) )
#define IS_DONE Inline_Stack_Done

double do_nothing1( AV *x, int sizeOfX ) {
    int index;

    for( index=0; index<sizeOfX; index++ ) {
        av_store( x, index, newSVnv( 1.0 ) );
    }
    return SvNV( *av_fetch( x, 0, NULL ) );
}

void do_nothing2( AV *a, SV *size ) {
    IS_VARS;
    int index;

    IS_RESET;
    for( index = 0; index < SvIV( size ); ++index ) {
        IS_PUSHNV( 1.0 );
    }
    IS_DONE;
}

void do_nothing3( SV*dummy, ... ) {
    IS_VARS;
    int index;

    for( index = 0; index < IS_ITEMS; ++index ) {
        IS_ITEM( index ) = newSVnv( 1.0 );
    }
    return;
}

AV *do_nothing4( AV *x ) {
    IS_VARS;
    AV *r = newAV();
    int index;

    for( index = 0; index < IS_ITEMS; ++index ) {
        av_push( r, newSVnv( SvNV( *av_fetch( x, index, NULL ) ) + 1.0 ) );
    }
    return r;
}


MODULE = _1159002  PACKAGE = main

PROTOTYPES: DISABLE


double
do_nothing1 (x, sizeOfX)
        AV *    x
        int     sizeOfX

void
do_nothing2 (a, size)
        AV *    a
        SV *    size
        PREINIT:
        I32* temp;
        PPCODE:
        temp = PL_markstack_ptr++;
        do_nothing2(a, size);
        if (PL_markstack_ptr != temp) {
          /* truly void, because dXSARGS not invoked */
          PL_markstack_ptr = temp;
          XSRETURN_EMPTY; /* return empty stack */
        }
        /* must have used dXSARGS; list context implied */
        return; /* assume stack size is correct */

void
do_nothing3 (dummy, ...)
        SV *    dummy
        PREINIT:
        I32* temp;
        PPCODE:
        temp = PL_markstack_ptr++;
        do_nothing3(dummy);
        if (PL_markstack_ptr != temp) {
          /* truly void, because dXSARGS not invoked */
          PL_markstack_ptr = temp;
          XSRETURN_EMPTY; /* return empty stack */
        }
        /* must have used dXSARGS; list context implied */
        return; /* assume stack size is correct */

AV *
do_nothing4 (x)
        AV *    x