[all-commits] [llvm/llvm-project] 470858: [LoongArch] Add DAG combines for vector widening e...

[hev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4708581453ead90685a55e343cc5ace1e1ddabb1
      https://github.com/llvm/llvm-project/commit/4708581453ead90685a55e343cc5ace1e1ddabb1
  Author: hev <wangrui at loongson.cn>
  Date:   2026-07-08 (Wed, 08 Jul 2026)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
    M llvm/test/CodeGen/LoongArch/lasx/xvexth.ll
    M llvm/test/CodeGen/LoongArch/lsx/vexth.ll

  Log Message:
  -----------
  [LoongArch] Add DAG combines for vector widening extends (#207316)

Lower:

```
  SEXT/ZEXT(High-Half-128-Bit-Lanes(vec))
```

to:

```
  LSX:  VEXTH.H.B, VEXTH.W.H, VEXTH.D.W
        VEXTH.HU.BU, VEXTH.WU.HU, VEXTH.DU.WU

  LASX: XVEXTH.H.B, XVEXTH.W.H, XVEXTH.D.W
        XVEXTH.HU.BU, XVEXTH.WU.HU, XVEXTH.DU.WU
```



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