[all-commits] [llvm/llvm-project] 53504f: [TableGen] Support HwMode registers in CompressIns...

[Alexander Richardson via All-commits]

  Branch: refs/heads/users/arichardson/spr/tablegen-support-hwmode-registers-in-compressinstemitter
  Home:   https://github.com/llvm/llvm-project
  Commit: 53504f5bec61abe417291f1f13a5799f94196ea6
      https://github.com/llvm/llvm-project/commit/53504f5bec61abe417291f1f13a5799f94196ea6
  Author: Alex Richardson <alexrichardson at google.com>
  Date:   2026-09-29 (Tue, 29 Sep 2026)

  Changed paths:
    M llvm/test/TableGen/RegClassByHwModeCompressPat.td
    A llvm/test/TableGen/RegClassByHwModeCompressPat4Modes.td
    A llvm/test/TableGen/RegClassByHwModeCompressPatError.td
    M llvm/utils/TableGen/Common/CodeGenHwModes.cpp
    M llvm/utils/TableGen/Common/CodeGenHwModes.h
    M llvm/utils/TableGen/Common/SubtargetFeatureInfo.cpp
    M llvm/utils/TableGen/Common/SubtargetFeatureInfo.h
    M llvm/utils/TableGen/CompressInstEmitter.cpp

  Log Message:
  -----------
  [TableGen] Support HwMode registers in CompressInstEmitter

Previously, CompressInstEmitter only handled plain Register and
RegisterClass records when matching and validating operands in
CompressPat definitions. Attempting to use a RegisterByHwMode (such as a
mode-dependent stack pointer) or a RegClassByHwMode with mode-dependent
registers failed because CompressInstEmitter could not resolve the
underlying register or register class for a given subtarget configuration.

Introduce HwModePredicates in CodeGenHwModes to resolve HwModeSelect
records using the subtarget features required by a CompressPat (with
predicates implying the absence of all non-default modes resolving to
DefaultMode). This allows using a single instruction definition for
compressed instructions like RISC-V C_ADDI4SPN/C_ADDI16SP across HwModes
instead of duplicating the instruction definitions for each mode.

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