[all-commits] [llvm/llvm-project] 029d9f: [AArch64][llvm] Add missing form for `LD64B`/`ST64...

[Jonathan Thackray via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 029d9fab2445abc6459ee3cf7f1100e332b7f0ac
      https://github.com/llvm/llvm-project/commit/029d9fab2445abc6459ee3cf7f1100e332b7f0ac
  Author: Jonathan Thackray <jonathan.thackray at arm.com>
  Date:   2026-05-07 (Thu, 07 May 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrFormats.td
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/MC/AArch64/armv8.7a-ls64.s

  Log Message:
  -----------
  [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-



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