[all-commits] [llvm/llvm-project] 365304: [RISCV][VLOPT] Add support for Vector Fixed-Point ...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 36530414e3fc49ce9c5a74acf3a68731965ea4d6
      https://github.com/llvm/llvm-project/commit/36530414e3fc49ce9c5a74acf3a68731965ea4d6
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-02-10 (Mon, 10 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
    M llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-vops.ll
    M llvm/test/CodeGen/RISCV/rvv/vl-opt-instrs.ll
    M llvm/test/CodeGen/RISCV/rvv/vl-opt.mir

  Log Message:
  -----------
  [RISCV][VLOPT] Add support for Vector Fixed-Point Arithmetic Instructions (#126483)

This patch adds the remaining support for fixed-point arithmetic
instructions (we previously had support for averaging adds and
subtracts).

For saturating adds/subs/multiplies/clips, we can't change `vl` if
`vxsat` is used, since changing `vl` may change its value. So this patch
checks to see if it's dead before considering it a candidate.



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