[all-commits] [llvm/llvm-project] 89fc01: [CodeGen][SVE] Legalisation of extends with scalab...

[kmclaughlin-arm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 89fc0166f53252956705935bfebbb70f06c47c8e
      https://github.com/llvm/llvm-project/commit/89fc0166f53252956705935bfebbb70f06c47c8e
  Author: Kerry McLaughlin <kerry.mclaughlin at arm.com>
  Date:   2020-06-05 (Fri, 05 Jun 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/ValueTypes.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
    M llvm/lib/CodeGen/ValueTypes.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/test/CodeGen/AArch64/sve-sext-zext.ll

  Log Message:
  -----------
  [CodeGen][SVE] Legalisation of extends with scalable types

Summary:
This patch adds legalisation of extensions where the operand
of the extend is a legal scalable type but the result is not.

EXTRACT_SUBVECTOR is used to split the result, before
being replaced by target-specific [S|U]UNPK[HI|LO] operations.

For example:

```
zext <vscale x 16 x i8> %a to <vscale x 16 x i16>
```
should emit:

```
uunpklo z2.h, z0.b
uunpkhi z1.h, z0.b
```

Reviewers: sdesmalen, efriedma, david-arm

Reviewed By: efriedma

Subscribers: tschuett, hiraditya, rkruppe, psnobl, huihuiz, cfe-commits, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D79587