------- Comment #8 from edwintorok at gmail dot com 2008-03-23 16:59 ------- (In reply to comment #7) > Subject: Re: [4.3/4.4 Regression]: gcc-4.3 -O3/-ftree-vectorize regression: > incorrect code generation > > This code violates c/c++ aliasing rules. >
-Wstrict-aliasing doesn't give a warning about it. Accessing the memory as uint32_t is done for performance reasons, the alternative would be to use byte-sized accesses. When reading, it would involve additional shift/or instructions. If the pointer is not aligned at 4 bytes, then uint32_t can't be done? If that is the case, a warning would be *very* useful. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35653
