Hi Jeff, > > * What versions of GCC offer SM3, SM4 and SHA3? They will be supported starting with GCC 8. > * What is AES and SHA2? How is it different from +crypto? > In short, +crypto = +eas +sha2. We are retro-actively splitting the Armv8.0-A Cryptographic extensions into two groups Based on the algorithm family. For more on this see the Arm ARM (version ca or newer) on page C3-219 in the note. https://developer.arm.com/products/architecture/a-profile/docs/ddi0487/latest/arm-architecture-reference-manual-armv8-for-armv8-a-architecture-profile > * Can we now use, say, -march=armv8.4-a+aes or -march=armv8.4-a+sha2 > instead of -march=armv8-a+crypto? Yes, that's correct. Regards, Tamar > > Jeff
