[all-commits] [llvm/llvm-project] d7af86: [RISCV] Added isCompressibleInst() to estimate siz...

[apazos via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d7af86bdd0bdc9509fd7fdc3ae34bb0f4b9d269f
      https://github.com/llvm/llvm-project/commit/d7af86bdd0bdc9509fd7fdc3ae34bb0f4b9d269f
  Author: Ana Pazos <apazos at quicinc.com>
  Date:   2019-12-16 (Mon, 16 Dec 2019)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
    M llvm/utils/TableGen/RISCVCompressInstEmitter.cpp

  Log Message:
  -----------
  [RISCV] Added isCompressibleInst() to estimate size in getInstSizeInBytes()

Summary:
Modified compression emitter tablegen backend to emit isCompressibleInst()
check which in turn is used by getInstSizeInBytes() to better estimate
instruction size. Note the generation of compressed instructions in RISC-V
happens late in the assembler therefore instruction size estimate might be off
if computed before.

Reviewers: lenary, asb, luismarques, lewis-revill

Reviewed By: asb

Subscribers: sameer.abuasal, lewis-revill, hiraditya, asb, rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, MaskRay, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, psnobl, benna, Jim, lenary, s.egerton, pzheng, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68290