https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77776
--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to g.peterhoff from comment #19) > * You were probably wondering why I wrote "if (std::isinf(x) | std::isinf(y) > | std::isinf(z))", for example. This is intentional. The problem is that gcc > almost always produces branch code for logical operations, so *a lot* of > conditional jumps. By using arithmetic operations, so instead of || && just > | &, I can get it to generate only actually necessary conditional jumps or > cmoves. branchfree code is always better. In general the code is not equivalent if any of the subexpressions has side effects, such as setting errno, raising an exception for a signalling nan etc. but I don't think we care about that here.
