Hi Tom, > On 24 Feb 2025, at 20:40, Tom Kacvinsky via Gcc <gcc@gcc.gnu.org> wrote: > > Hi all, > > I am trying to find where the aarch64 SIMD built in types are defined in > GCC. > For instance, __Int8x8_t. I see some code in gcc/config/aarch64 for these, > but > then it goes deeper into internals of gcc that I don't quite follow. > > Any help pointing to where I should look would be appreciated. >
The logic for defining them is in aarch64-builtins.cc . The information about them is tracked in aarch64_simd_type_info structs. There’s some preprocessor machinery at work so it may not be obvious how it works from a first read. There are user-level typedefs in arm_private_neon_types.h that is later included standard ACLE headers like arm_neon.h and arm_sve.h What particular information are you looking for? Thanks, Kyrill > Thanks, > > Tom
