LLVM Language Reference for Prefix Data self-contradictory re: function entry point versus function descriptor

[hubert-reinterpretcast]

https://llvm.org/docs/LangRef.html#prefix-data says:

Prefix data is data associated with a function which the code generator will emit immediately before the function’s entrypoint.

However, it goes on to say:

To access the data for a given function, a program may bitcast the function pointer to a pointer to the constant’s type and dereference index -1.

These statements are contradictory for targets that use function descriptors (an example being the 64-bit PowerPC ELFv1 ABI: https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-DES).

[llvmbot]

@llvm/issue-subscribers-backend-aarch64

Author: Hubert Tong (hubert-reinterpretcast)

https://llvm.org/docs/LangRef.html#prefix-data says:

> Prefix data is data associated with a function which the code generator will emit immediately before the function’s entrypoint.

However, it goes on to say:

> To access the data for a given function, a program may bitcast the function pointer to a pointer to the constant’s type and dereference index -1.

These statements are contradictory for targets that use function descriptors (an example being the 64-bit PowerPC ELFv1 ABI: https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-DES).