+ 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.
Huh? It's not big enough to be negative when considered as a 32-bit
number...
0x1fffffff isn't, right; and that makes it a signed int. Applying
the complement operator to it turns it negative. And then the
implicit cast (because tmp is 64-bit) makes it 64-bit, still the
same negative value. Which is the expected result, but via a way
too tricky (and fragile) path :-)
Segher
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