[all-commits] [llvm/llvm-project] fa4361: [RISCV] Expand scalar FP undef/poison to 0.0 with ...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fa43610d69293a36e54accc5d7864b93ced9c8a4
      https://github.com/llvm/llvm-project/commit/fa43610d69293a36e54accc5d7864b93ced9c8a4
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2026-09-22 (Tue, 22 Sep 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/bfloat-imm.ll
    M llvm/test/CodeGen/RISCV/double-imm.ll
    M llvm/test/CodeGen/RISCV/float-imm.ll
    M llvm/test/CodeGen/RISCV/half-imm.ll

  Log Message:
  -----------
  [RISCV] Expand scalar FP undef/poison to 0.0 with F extension. (#225567)

This ensures the undef/poison value is always nan-boxed. This is
important if the value ends up being used by a freeze. If the value
isn't properly nan-boxed, it will be treated as a nan in FP contexts
regardless of its lower bits. If the freeze is also cast to an integer,
the lack of nan-boxing will be noticed and the integer will see the real
value of the lower bits.

Fixes #225455.



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