[all-commits] [llvm/llvm-project] 3e0e1c: [RISCV][GISel] Support fp128 arithmetic and conver...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3e0e1c13ce96dfe291ffaf9edc9876cdd5016a0d
      https://github.com/llvm/llvm-project/commit/3e0e1c13ce96dfe291ffaf9edc9876cdd5016a0d
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-12-04 (Wed, 04 Dec 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h
    M llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp
    A llvm/test/CodeGen/RISCV/GlobalISel/fp128.ll

  Log Message:
  -----------
  [RISCV][GISel] Support fp128 arithmetic and conversion for RV64. (#118707)

We can support these via libcalls in libgcc/compiler-rt or integer
operations for fneg/fabs/fcopysign. fp128 values will be passed in two
64-bit GPRs according to the psABI.

Supporting RV32 requires sret which is not supported by libcall handling
in LegalizerHelper.cpp yet. It doesn't call canLowerReturn.



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