Please modify this MS specific C code to compile under gcc on both 32-bit & 64-bit platforma and produce the same output:

Pointer 1<<34 doesn't make sense on 32-bit platforms.

I also don't see how you can get the same output on 32-bit and 64-bit platforms when ALIGN_BITS depends on the pointer size (sizeof(void*) >> 1i64). The data or ALIGN_BITS would need to be changed.

On to the real question, you need the following to be configurable:

• The integer type that corresponds to a pointer (uintptr_t),
• the format specifiers for uintptr_t constants (UINTPTR_CONST) and
• the printf format specifiers for uintptr_t (UINTPTRXf).

So here goes:

#include <stdio.h>

/* **** For a system where a pointer is an unsigned long long: */
typedef unsigned long long uintptr_t;
#define UINTPTR_CONST(p) ((uintptr_t)p##ULL)
#define UINTPTRXf "llX"

/* **** For a system where a pointer is an unsigned long:
typedef unsigned long uintptr_t;
#define UINTPTR_CONST(p) ((uintptr_t)p##UL)
#define UINTPTRXf "lX"
*/

#define NOP_BITS     2
#define BIT_BITS     3
#define BYTE_BITS    14

#define NOP_MASK     UINTPTR_CONST(0x00000003)
#define BIT_MASK     UINTPTR_CONST(0x00000007)
#define BYTE_MASK    UINTPTR_CONST(0x00003FFF)

#define NOP_OFFSET   0
#define BIT_OFFSET   (sizeof(void*) >> 1)
#define BYTE_OFFSET  (BIT_OFFSET + BIT_BITS)
#define SLOT_OFFSET  (BYTE_OFFSET + BYTE_BITS)

void check_new(void* p) {
    register uintptr_t i = (uintptr_t)p;
    uintptr_t slot = ( i >> SLOT_OFFSET );
    uintptr_t byte = ( i >> BYTE_OFFSET ) & BYTE_MASK;
    uintptr_t bit  = ( i >> BIT_OFFSET  ) & BIT_MASK;
    uintptr_t nop  = ( i >> NOP_OFFSET  ) & NOP_MASK;

    printf("address: %012p "
           "slot: %012p "
           "byte: %4"UINTPTRXf" "
           "bit: %4"UINTPTRXf" "
           "nop: %"UINTPTRXf"\n",
        p, (void*)slot, byte, bit, nop
    );
}

int main(int argc, char *argv[]) {
    void* p;
    for (
        p = (void*)UINTPTR_CONST(123456);
        p < (void*)(UINTPTR_CONST(1) << 34);
        p += (UINTPTR_CONST(1) << 29)
    )
        check_new(p);

    return 0;
}
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