> In PR #31669 for [JDK-8386593](https://bugs.openjdk.org/browse/JDK-8386593), 
> we discoverd `DW_CFA_offset_extended` and `DW_CFA_restore_extended` are not 
> supported in SA.
> 
> GCC on Fedora 44 and Ubuntu 26.04 (at least) generates DWARF instructions in 
> below:
> 
> 
>   DW_CFA_offset_extended: r79 (v15) at cfa-16
>   DW_CFA_advance_loc: 204 to 00000000006646e4
>   DW_CFA_restore: r30 (x30)
>   DW_CFA_restore: r29 (x29)
>   DW_CFA_restore: r19 (x19)
>   DW_CFA_restore: r20 (x20)
>   DW_CFA_restore_extended: r79 (v15)
> 
> 
> We need to add `DW_CFA_offset_extended` and `DW_CFA_restore_extended`, and 
> vector registers for AArch64 which are defined in [DWARF for the ArmĀ® 64-bit 
> Architecture 
> (AArch64)](https://github.com/ARM-software/abi-aa/blob/2025Q4/aadwarf64/aadwarf64.rst#dwarf-register-names).
> 
> ---------
> - [x] I confirm that I make this contribution in accordance with the [OpenJDK 
> Interim AI Policy](https://openjdk.org/legal/ai).

Yasumasa Suenaga has updated the pull request incrementally with one additional 
commit since the last revision:

  Add comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/31999/files
  - new: https://git.openjdk.org/jdk/pull/31999/files/a694e555..56538036

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=31999&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=31999&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/31999.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/31999/head:pull/31999

PR: https://git.openjdk.org/jdk/pull/31999

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