Tux Many thanks for your assistance. Up for a bit more?

In theory, based on my reading the gcc headers, this should compile clean under 32/64-bit. It probably won't, but once you recover from your seasonal revelries, I'd appreciated seeing the warnings/errors produced on your various platforms.

#include <stdio.h>
#define __STDC_LIMIT_MACROS
#include <stdint.h>
#include <stddef.h>

#define ALIGN_BITS  ( sizeof(void*) >> __UINT64_C( 1 ) )
#define BIT_BITS     __UINT64_C( 3 )
#define BYTE_BITS   __UINT64_C( 14 )
#define SLOT_BITS   ( sizeof( void*) * 8 ) - ( ALIGN_BITS + BIT_BITS +
+ BYTE_BITS )
#define BYTES_PER_SLOT  __UINT64_C( 1 ) << BYTE_BITS
#define TRACKING_SLOTS  8192 // max. 8192 for 4GB/32-bit machine

int check_new( uintptr_t p ) {
    ptrdiff_t slot = ( p >> (BYTE_BITS + BIT_BITS + ALIGN_BITS) );
    ptrdiff_t byte = ( p >> (ALIGN_BITS + BIT_BITS)) & __UINT64_C( 0x0
+0003fff )
    ptrdiff_t bit  = ( p >> ALIGN_BITS)              & __UINT64_C( 0x0
+0000007 );
    ptrdiff_t nop  =   p                             & __UINT64_C( 0x3
+        );

    printf(
        "address: %p slot: %p byte: %4x bit: %4x nop:%x\n",
        p, slot, byte, bit, nop
    );
    return 1;
}

void main( void ) {
    uintptr_t p;

    for( p = __UINT64_C( 123456 ); p < ( __UINT64_C( 1 ) << 34 ); p +=
+ ( __UINT64_C( 1 ) << 29 ) ) {
        check_new( p );
    }
}
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