[all-commits] [llvm/llvm-project] 30f386: [AArch64] Fixup destructive floating-point precisi...

[SpencerAbson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 30f386cb4d43d0bd8f57c49f68f71defd7dcf968
      https://github.com/llvm/llvm-project/commit/30f386cb4d43d0bd8f57c49f68f71defd7dcf968
  Author: SpencerAbson <Spencer.Abson at arm.com>
  Date:   2024-12-19 (Thu, 19 Dec 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
    M llvm/lib/Target/AArch64/SVEInstrFormats.td
    M llvm/test/MC/AArch64/SVE/bfcvtnt-diagnostics.s
    M llvm/test/MC/AArch64/SVE/bfcvtnt.s

  Log Message:
  -----------
  [AArch64] Fixup destructive floating-point precision conversions (#118788)

This patch changes the zeroing forms of `FCVTXNT`, `FCVTNT`, and
`BFCVTNT` such that their destination operand is also listed as a dag
input. These narrowing down-conversions leave the even elements of the
destination vector unchanged, regardless of the predicate type.

This patch also makes the merging form of `BFCVTNT` non-movprfx'able.

- `FCVTXNT` - [Arm
Developer](https://developer.arm.com/documentation/ddi0602/2024-09/SVE-Instructions/FCVTXNT--Floating-point-down-convert--rounding-to-odd--top--predicated--?lang=en)
- `FCVTNT` - [Arm
Developer](https://developer.arm.com/documentation/ddi0602/2024-09/SVE-Instructions/FCVTNT--predicated---Floating-point-down-convert-and-narrow--top--predicated--?lang=en)
- `BFCVTNT` - [Arm
Developer](https://developer.arm.com/documentation/ddi0602/2024-09/SVE-Instructions/BFCVTNT--Floating-point-down-convert-and-narrow-to-BFloat16--top--predicated--?lang=en)



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