[all-commits] [llvm/llvm-project] 7192c2: [GlobalISel][RISCV] Use constant pool for large in...

[Mikhail Gudim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7192c22ee43500b1a6313d1ade38e002463944a6
      https://github.com/llvm/llvm-project/commit/7192c22ee43500b1a6313d1ade38e002463944a6
  Author: Mikhail Gudim <mgudim at gmail.com>
  Date:   2024-02-10 (Sat, 10 Feb 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp
    M llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.h
    M llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-bitreverse-rv64.mir
    M llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-const-rv64.mir

  Log Message:
  -----------
  [GlobalISel][RISCV] Use constant pool for large integer constants. (#81101)

We apply custom lowering to 64 bit constants where we use the same logic
as in non-global isel: if materializing in registers is too expensive,
we emit a load from constant pool. Later, during instruction selection,
constant pool address is generated using `selectAddr`.