[all-commits] [llvm/llvm-project] 053346: [RISCV][MC][NFC] Update IME vtype layout to match ...

[Kiva via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 053346636c3abc150dcecc92ec60e1576130280e
      https://github.com/llvm/llvm-project/commit/053346636c3abc150dcecc92ec60e1576130280e
  Author: Kiva <zengtao at iscas.ac.cn>
  Date:   2026-05-07 (Thu, 07 May 2026)

  Changed paths:
    M llvm/lib/TargetParser/RISCVTargetParser.cpp
    M llvm/unittests/TargetParser/RISCVTargetParserTest.cpp

  Log Message:
  -----------
  [RISCV][MC][NFC] Update IME vtype layout to match latest spec `riscv-isa-release-fa55752-2026-05-04` (#195998)

This updates the IME-specific vtype field layout to match the [latest
IME spec, version
riscv-isa-release-fa55752-2026-05-04](https://github.com/riscv/integrated-matrix-extension/blob/main/src/integrated-matrix.adoc#new-fields-in-the-vector-type-vtype-register).
The latest spec places the IME fields as:

| Field         | New Position              | Change Description              |
|---------------|---------------------------|---------------------------------|
| `lambda[2:0]` | `vtype[XLEN-2:XLEN-4]`   | Unchanged                       |
| `bs`          | `vtype[XLEN-5]`          | Moved from `vtype[XLEN-7]`     |
| `altfmt_A`    | `vtype[XLEN-6]`          | Moved from `vtype[XLEN-5]`     |
| `altfmt_B`    | `vtype[XLEN-7]`          | Moved from `vtype[XLEN-6]`     |

Previously `bs`, `altfmt_A`, and `altfmt_B` followed the older ordering,
which was first introduced in #193956. The new position of altfmt
supports growing in the future for more datatypes.
This patch also updates tests to reflect field changes.

Currently this should be NFC since we didn't have any CodeGen
implementation that involves vtype in IME.



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