Timeline for Calculate to how many cubes one cube can be cut
Current License: CC BY-SA 3.0
8 events
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| Jun 17, 2020 at 9:04 | history | edited | CommunityBot |
Commonmark migration
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| Jul 23, 2014 at 22:17 | comment | added | Level River St | ideone behaves exactly like GCC. ideone.com/EpKTpO | |
| Jul 23, 2014 at 8:01 | comment | added | Level River St |
@Manav indeed it should become zero. As I say, the compiler has a bug. NUM>>i becomes NUM>>(i%64) or equivalently NUM>>(i&63)because the compiler is truncating the leftmost bits of i before performing the bitshift. GCC only considers only the rightmost 6 bits. Visual Studio has the same bug but is slightly better, considering only the rightmost 8 bits NUM>>(i%256). Out of curiosity I will try Ideone when I get home from work.
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| Jul 23, 2014 at 5:56 | comment | added | manav m-n |
@steveverrill please explain how NUM>>i changes to NUM>>i%64. Also if a 64-bit number is right shifted more than 64 times it should become zero
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| Jul 22, 2014 at 20:27 | comment | added | Level River St |
Indeed, we even have basically the same constant (with bit zero unused and bit 1 representing the number 1.) In C I save a single byte by specifying the constant in hex. I have a 0 for bit zero, I could change it for a 1 like yours for the case i=0. But it never gets displayed anyway.
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| Jul 22, 2014 at 20:15 | comment | added | Somnium | This uses exactly the same principle as mine answer) | |
| Jul 22, 2014 at 20:07 | history | edited | Level River St | CC BY-SA 3.0 |
deleted 1 character in body
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| Jul 22, 2014 at 20:01 | history | answered | Level River St | CC BY-SA 3.0 |