[all-commits] [llvm/llvm-project] 8ec24a: [Mips] Remove the subtarget reset pass (#225833)

[Jiaxun Yang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8ec24aa666a738c7258e2541a40b2e53bd7902ec
      https://github.com/llvm/llvm-project/commit/8ec24aa666a738c7258e2541a40b2e53bd7902ec
  Author: Jiaxun Yang <jiaxun.yang at flygoat.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Target/Mips/CMakeLists.txt
    M llvm/lib/Target/Mips/Mips.h
    M llvm/lib/Target/Mips/Mips16HardFloat.cpp
    M llvm/lib/Target/Mips/MipsBranchExpansion.cpp
    M llvm/lib/Target/Mips/MipsISelLowering.cpp
    R llvm/lib/Target/Mips/MipsModuleISelDAGToDAG.cpp
    M llvm/lib/Target/Mips/MipsSubtarget.cpp
    M llvm/lib/Target/Mips/MipsSubtarget.h
    M llvm/lib/Target/Mips/MipsTargetMachine.cpp
    M llvm/lib/Target/Mips/MipsTargetMachine.h
    M llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
    M llvm/lib/Target/Mips/MipsTargetObjectFile.h
    M llvm/test/CodeGen/Mips/mips16-hf-attr.ll
    M llvm/test/CodeGen/Mips/mips16_32_1.ll
    M llvm/test/CodeGen/Mips/mips16_32_10.ll
    M llvm/test/CodeGen/Mips/mips16_32_3.ll
    M llvm/test/CodeGen/Mips/mips16_32_4.ll
    M llvm/test/CodeGen/Mips/mips16_32_5.ll
    M llvm/test/CodeGen/Mips/mips16_32_6.ll
    M llvm/test/CodeGen/Mips/mips16_32_7.ll
    M llvm/test/CodeGen/Mips/mips16_32_8.ll
    M llvm/test/CodeGen/Mips/mips16_32_9.ll
    M llvm/test/CodeGen/Mips/small-section-reserve-gp.ll
    M llvm/test/Transforms/DivRemPairs/Mips/div-expanded-rem-pair.ll
    M llvm/utils/gn/secondary/llvm/lib/Target/Mips/BUILD.gn

  Log Message:
  -----------
  [Mips] Remove the subtarget reset pass (#225833)

MIPS updates a target-machine-wide subtarget pointer before instruction
selection. This makes global section placement depend on the last
compiled function and leaves mixed-mode decisions tied to module state.

Use each function's subtarget for lowering, TTI and MIPS16 hard-float
handling, and retain the default subtarget's small-data policy for
global placement. Remove the reset pass, unused fixed subtargets and the
redundant mips-mixed-16-32 option.

Assisted-by: chatgpt-5.6-luna # Testcases



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