On Tue, Apr 18, 2017 at 4:32 AM, Marc Glisse <marc.glisse@xxxxxxxx> wrote: > On Tue, 18 Apr 2017, Jeffrey Walton wrote: > >> I'm having trouble locating the builtin functions for the SHA >> extensions. The 5.4 and 6.3 docs do not list them. (See, for example, >> >> https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/x86-Built-in-Functions.html#x86-Built-in-Functions). >> >> What are the builtin functions for the various SHA extensions, like >> _mm_sha256rnds2_epu32? > > > Uh, open the file shaintrin.h and see what builtins are used there? Why are > you looking at the builtins anyway? I can see why people use intrinsics, or > why they use inline asm, but not builtins. Thanks. We can't use intrinsics because they are only available when -msha is used during compile. Some compilers don't add the necessary flags, even with -march=native. Some users and distros don't add that flag. Also see GCC Issue 57202. Jeff
