tree 8c6613121eda6492aeafbdd5e7dc81b4f4a48431
parent 555aa1990e98590eab1dab41e3c3c28a2d1cb87a
author Jonathan Thackray <jonathan.thackray@arm.com> 1778166729 +0100
committer GitHub <noreply@github.com> 1778166729 +0100
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[AArch64][llvm] Add missing form for `LD64B`/`ST64B` instructions (#196301)

`LD64B` and `ST64B` are defined as follows[1]:
```
  LD64B <Xt>, [<Xn|SP> {,#0}]
```

but they're missing the form that allows a zero immediate offset,
for example:
```
  ld64b x2, [x13, #0]
  st64b x16, [x13, #0]
```

Add support for zero immediate offsets for these instructions.

[1] https://developer.arm.com/documentation/ddi0602/2022-09/Base-Instructions/LD64B--Single-copy-Atomic-64-byte-Load-