On Fri, Dec 8, 2017 at 12:28 PM, Marc Glisse <marc.glisse@xxxxxxxx> wrote: > On Fri, 8 Dec 2017, Jeffrey Walton wrote: > ... >> According to the Intel Intrinsics Guide (e.g., _mm_load_sd): >> >> Load a double-precision (64-bit) floating-point element from memory >> into the lower of dst, and zero the upper element. mem_addr does >> not need to be aligned on any particular boundary. >> >> Should GCC be producing a finding in this case? Is there a way to work >> around it without an extra memcpy? > > The way _mm_load_sd is currently implemented in gcc, yes, sanitizers are > right to complain. Intel could have named the thing _mm_loadu_sd if that's > what they meant. It would be simple to change if we decide to do so, please > file a PR in bugzilla. > > Workaround: define a typedef for double with > __attribute__((__aligned__(1))), and use _mm_set_sd(*(newtype*)p), that's > how it will likely be done if we change emmintrin.h. Thanks again Marc. I opened an issue at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84508 . Jeff
