[23.10 FEAT] [GNU2219] GCC Preserve register arguments support

[bugproxy]

Feature Description:

Owing to performance concerns and in order to be able to access function arguments it is required:
  1. to store the argument register content to the stack
  2. generate proper CFI to allow the unwinder to locate it

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2023-07-02 18:29 EDT-------
The following 3 patches are required for this feature:

New reg note REG_CFA_NORESTORE
ef5f7b89bbc352255595069eb870d6f30f1f9134

IBM zSystems: Make stack_tie to work with hard frame pointer
36ffb2e0293d1bbef30e3553a431679de00549b9

IBM zSystems: Save argument registers to the stack -mpreserve-args
8091199cdf4d0aa9c28e4526548ddc25d02898ca

(FYI: The last patch contains two testcases for the GCC testsuite)

[Matthias Klose (doko)]

reassigning to gcc-13, which will be the default GCC for 23.10. We will only pick up that one for gcc-12, if it is applied upstream in the gcc-12 branch.

[Frank Heimes (fheimes)]

Just a quick addon:
The toolchain update (to gcc-13 as default) in mantic is already planned for July the 13th, according to the "Mantic Minotaur Release Schedule": https://discourse.ubuntu.com/t/mantic-minotaur-release-schedule (so pretty soon)

[Matthias Klose (doko)]

GCC 13 is now the default