[all-commits] [llvm/llvm-project] 7e8ff2: [RISCV][GISel] Optimize +0.0 to use fcvt.d.w for s...

[Shaoce SUN via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7e8ff2afa9ddfe1d7c42bb58cc9523006c34396b
      https://github.com/llvm/llvm-project/commit/7e8ff2afa9ddfe1d7c42bb58cc9523006c34396b
  Author: Shaoce SUN <sunshaoce at outlook.com>
  Date:   2025-08-18 (Mon, 18 Aug 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/GISel/RISCVInstructionSelector.cpp
    M llvm/test/CodeGen/RISCV/GlobalISel/double-arith.ll
    M llvm/test/CodeGen/RISCV/GlobalISel/instruction-select/fp-constant.mir

  Log Message:
  -----------
  [RISCV][GISel] Optimize +0.0 to use fcvt.d.w for s64 on rv32 (#153978)

Resolve the TODO: on RV32, when constructing the double-precision
constant `+0.0` for `s64`, `BuildPairF64Pseudo` can be optimized to use
the `fcvt.d.w` instruction to generate the result directly.



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