[PATCH] D114950: [RISCV] Promote large integers to constant pool

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For large integers (for example, magic numbers generated by
TargetLowering::BuildSDIV when divided by constant), we may
need about 4~8 instructions to construct them.
In the same time, it just takes two instructions to load
constants (with extra cycles to access memory), so it may be
profitable to promote these integers to constant pool.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D114950

Files:
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/lib/Target/RISCV/RISCVSubtarget.cpp
  llvm/lib/Target/RISCV/RISCVSubtarget.h
  llvm/test/CodeGen/RISCV/bswap-ctlz-cttz-ctpop.ll
  llvm/test/CodeGen/RISCV/div.ll
  llvm/test/CodeGen/RISCV/double-imm.ll
  llvm/test/CodeGen/RISCV/imm.ll
  llvm/test/CodeGen/RISCV/rv64zbb.ll
  llvm/test/CodeGen/RISCV/rv64zbp.ll
  llvm/test/CodeGen/RISCV/rvv/bitreverse-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/ctlz-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/ctpop-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/cttz-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-bitreverse.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctlz.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctpop.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-cttz.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-mask-buildvec.ll
  llvm/test/CodeGen/RISCV/rvv/interleave-crash.ll
  llvm/test/CodeGen/RISCV/rvv/vdiv-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vrem-sdnode.ll
  llvm/test/CodeGen/RISCV/srem-lkk.ll
  llvm/test/CodeGen/RISCV/srem-seteq-illegal-types.ll
  llvm/test/CodeGen/RISCV/srem-vector-lkk.ll
  llvm/test/CodeGen/RISCV/urem-lkk.ll
  llvm/test/CodeGen/RISCV/urem-vector-lkk.ll
  llvm/test/CodeGen/RISCV/vararg.ll

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