On Mon, May 30, 2016 at 10:07 AM, Florian Weimer <fweimer@xxxxxxxxxx> wrote: > On 05/30/2016 06:00 AM, Jeffrey Walton wrote: > >> longjmp(s_jmpNoCRC32, 1); > > > You should use siglongjmp and sigsetjmp. > >> uint32_t w=0, x=0; uint16_t y=0; uint8_t z=0; >> w = __crc32cw(w,x); >> w = __crc32ch(w,y); >> w = __crc32cb(w,z); > > > The final w value is never used. You need to make volatile, or otherwise > ensure that the computation does not happen at compile time. Sorry to dig up an old thread. This looks like a known bug that's kind of being worked on: "C Compilers Disprove Fermat’s Last Theorem", https://blog.regehr.org/archives/140. Jeff
