[all-commits] [llvm/llvm-project] c5e941: [LoongArch] Support VBIT{CLR, SET, REV}I patterns fo...

[hev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c5e941d7226573557d7fbef843a580a1d2c0d245
      https://github.com/llvm/llvm-project/commit/c5e941d7226573557d7fbef843a580a1d2c0d245
  Author: hev <wangrui at loongson.cn>
  Date:   2026-04-28 (Tue, 28 Apr 2026)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelDAGToDAG.cpp
    M llvm/lib/Target/LoongArch/LoongArchISelDAGToDAG.h
    M llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
    M llvm/test/CodeGen/LoongArch/lasx/bitclr.ll
    M llvm/test/CodeGen/LoongArch/lasx/bitrev.ll
    M llvm/test/CodeGen/LoongArch/lasx/bitset.ll
    M llvm/test/CodeGen/LoongArch/lsx/bitclr.ll
    M llvm/test/CodeGen/LoongArch/lsx/bitrev.ll
    M llvm/test/CodeGen/LoongArch/lsx/bitset.ll

  Log Message:
  -----------
  [LoongArch] Support VBIT{CLR,SET,REV}I patterns for non-native element sizes (#193719)

Extend vsplat_uimm_{pow2,inv_pow2} matching to allow specifying an
explicit element bit width, enabling recognition of splat patterns whose
logical element size differs from the vector's native element type.

Introduce templated selectVSplatUimm{Pow2,InvPow2} helpers with an
optional EltSize parameter, and add corresponding ComplexPattern
definitions for i8/i16/i32 element widths. This allows TableGen patterns
to match cases such as operating on v8i32/v4i64 vectors with masks
derived from smaller element sizes.

With these changes, AND/OR/XOR operations using inverse power-of-two or
power-of-two splat masks are now correctly selected to VBITCLRI,
VBITSETI, and VBITREVI instructions instead of falling back to vector
logical operations with materialized constants.



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