[quake3-bugzilla] [Bug 6432] Undefined behavior

[bugzilla-daemon at icculus.org]

https://bugzilla.icculus.org/show_bug.cgi?id=6432

--- Comment #1 from Eugene C. <mine at ukr.net> ---
Here is another jumpless macro that correctly handles overflows (i.e. always
returns 0xFFFFFFFF) for input values in range [33..63]: 
#define MASK_32BITS(shift) ( ( ( (1 << (shift)) )  & ~( (((shift) & 0xFFFFFFE0
) >> 5) << shift ) ) - 1 )
Jumpless version that correctly handles 64-bit integers but not
overflows[33..63]:
#define MASK_32BITS(shift) ( ( ( (1 << (shift)) ) & ~( ((shift) & 32) >> 5 ) )
- 1 )

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