On 7/18/22 12:36, Daniel Kiss via Gcc wrote: > Hello, > > We are going to add Function Multiversioning [1] support to Arm architectures. > The specification is made public as beta[2] to ensure toolchain that follows > Arm > C Language Extension will implement it in the same way. > > A few tweaks considered to make the developers' life easier. > Since the `target` attribute is used widely on Arm, we would like to > introduce a > new attribute `target_version` to avoid confusion and possible deployment > problems. The `target_clones` attribute will be supported too. Also the > “default” > version to be made optional. > > We are looking for feedback on the specification (reply, github works too). > > Thanks so much, > Daniel > > [1] https://gcc.gnu.org/onlinedocs/gcc/Function-Multiversioning.html > [2] > https://github.com/ARM-software/acle/blob/main/main/acle.md#function-multi-versioning >
Hey. I've just spent some time looking into https://gitlab.com/x86-psABIs/i386-ABI ABI and I noticed you may define something similar to: GNU 0x00000020 NT_GNU_PROPERTY_TYPE_0 Properties: x86 ISA needed: x86-64-baseline, x86-64-v2, x86-64-v3, x86-64-v4 x86 feature used: x86 Where GNU_PROPERTY_X86_FEATURE_2_NEEDED has only 4B pr_data field. In you case you have ~60 features or so, which barely fits into 8B even. If you plan to add a something similar (GNU_PROPERTY_AARCH64_FEATURE_NEEDED or something similar), keep that in mind. Cheers, Martin
