[all-commits] [llvm/llvm-project] f3aebe: [llvm][ARM] Add Addend Checks for MOVT and MOVW in...

[Jack Styles via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f3aebe623b49b7ae14d0f0996999114aac052e4b
      https://github.com/llvm/llvm-project/commit/f3aebe623b49b7ae14d0f0996999114aac052e4b
  Author: Jack Styles <jack.styles at arm.com>
  Date:   2024-10-14 (Mon, 14 Oct 2024)

  Changed paths:
    M llvm/docs/ReleaseNotes.md
    M llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
    M llvm/test/MC/ARM/Windows/mov32t-range.s
    A llvm/test/MC/ARM/arm-movt-movw-range-fail.s
    A llvm/test/MC/ARM/arm-movt-movw-range-pass.s
    M llvm/test/MC/ARM/macho-movwt.s
    M llvm/test/MC/MachO/ARM/thumb2-movw-fixup.s

  Log Message:
  -----------
  [llvm][ARM] Add Addend Checks for MOVT and MOVW instructions. (#111970)

Previously, any value could be used for the MOVT and MOVW instructions,
however the ARM ABI dictates that the addend should be a signed 16 bit
value. To ensure this is followed, the Assembler will now check that
when using these instructions, the addend is a 16bit signed value, and
throw an error if this is not the case.

Information relating to the ABI requirements can be found here:
https://github.com/ARM-software/abi-aa/blob/main/aaelf32/aaelf32.rst#addends-and-pc-bias-compensation



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