------- Comment #2 from dvt at isoft dot fr 2007-11-29 17:09 ------- (In reply to comment #1) > You are violating C aliasing rules. Use memcpy (as you did) or a union to > guard > the type punning. > *** This bug has been marked as a duplicate of 21920 ***
Are-you sure? Were is the rule that forbids to do this? And even if this is the case, this is for us a crucial matter of optimization: other compilers allow that, and optimize this cast. If gcc cannot do that (which also means that you (double*)(void*)(&d) should not work too), it should at least provide a way to do such an operation more efficiently that doing a memcpy! An how do-you explain that without optimization it works, then? For us, it is a big problem, and this means that we cannot really rely on gcc! -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34295
