[all-commits] [llvm/llvm-project] dedf01: [LoongArch] lower SCALAR_TO_VECTOR to INSERT_VECTO...

[tangaac via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dedf014901cecd7ba3bbc1aadb17098a5a95b8a7
      https://github.com/llvm/llvm-project/commit/dedf014901cecd7ba3bbc1aadb17098a5a95b8a7
  Author: tangaac <tangyan01 at loongson.cn>
  Date:   2025-01-22 (Wed, 22 Jan 2025)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.h
    M llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
    A llvm/test/CodeGen/LoongArch/lasx/scalar-to-vector.ll
    M llvm/test/CodeGen/LoongArch/lsx/build-vector.ll
    A llvm/test/CodeGen/LoongArch/lsx/scalar-to-vector.ll
    M llvm/test/CodeGen/LoongArch/vector-fp-imm.ll

  Log Message:
  -----------
  [LoongArch] lower SCALAR_TO_VECTOR to INSERT_VECTOR_ELT (#122863)

```llvm
define <16 x i8> @scalar_to_16xi8(i8 %val) {
  %ret = insertelement <16 x i8> undef, i8 %val, i32 0
  ret <16 x i8> %ret
}
```

before
```asm
addi.d	$sp, $sp, -16
st.b	$a0, $sp, 0
vld	$vr0, $sp, 0
addi.d	$sp, $sp, 16
ret
```

after
```asm
vinsgr2vr.b $vr0, $a0, 0
ret
```

---------

Co-authored-by: Lu Weining <luweining at loongson.cn>



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