[all-commits] [llvm/llvm-project] 7cc1f3: [llvm][RISCV] Optimize fabs for fixed vectors (#19...

[Brandon Wu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7cc1f32481015e50f29c9caf92524201bbdb0a50
      https://github.com/llvm/llvm-project/commit/7cc1f32481015e50f29c9caf92524201bbdb0a50
  Author: Brandon Wu <brandon.wu at sifive.com>
  Date:   2026-05-10 (Sun, 10 May 2026)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
    M llvm/test/CodeGen/ARM/vfloatintrinsics.ll
    M llvm/test/CodeGen/NVPTX/f16x2-instructions.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfabs-sdnode.ll
    M llvm/test/CodeGen/Thumb2/mve-fp-negabs.ll
    M llvm/test/CodeGen/Thumb2/mve-vabd.ll

  Log Message:
  -----------
  [llvm][RISCV] Optimize fabs for fixed vectors (#194554)

vfabs is not available on zvfhmin or zvfbfmin, it's expected to expand
to integer operations instead of unrolling to scalar operations.
General expandFABS already handles that in most of cases except for
fixed vector types that are not promotable, we need to find a better
heuristic to gate this.



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