+       tmp = tmp & ~0x000000001FFFFFFF;

Note that this only works as you expect because the constant is
signed here -- the extra zeroes do not magically make it a 64-bit
number.  So it goes 32-bit 0x1fffffff -> 32-bit -0x20000000 ->
64-bit -0x20000000.

Please consider writing it with an "L" suffix, or "UL" even, to
reduce trickiness and surprises if ever that number is changed.


Segher

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