[all-commits] [llvm/llvm-project] 9428f1: [CodeGen] Use SmallSetVector for getRegAllocationH...

[Nick Desaulniers via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9428f1b09f54d85f248b00d4e8aadb6cf0ad8098
      https://github.com/llvm/llvm-project/commit/9428f1b09f54d85f248b00d4e8aadb6cf0ad8098
  Author: Nick Desaulniers <ndesaulniers at google.com>
  Date:   2026-10-02 (Fri, 02 Oct 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetRegisterInfo.h
    M llvm/lib/CodeGen/AllocationOrder.cpp
    M llvm/lib/CodeGen/TargetRegisterInfo.cpp
    M llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
    M llvm/lib/Target/AArch64/AArch64RegisterInfo.h
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.h
    M llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
    M llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
    M llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
    M llvm/lib/Target/PowerPC/PPCRegisterInfo.h
    M llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
    M llvm/lib/Target/RISCV/RISCVRegisterInfo.h
    M llvm/lib/Target/SystemZ/SystemZRegisterInfo.cpp
    M llvm/lib/Target/SystemZ/SystemZRegisterInfo.h
    M llvm/lib/Target/X86/X86RegisterInfo.cpp
    M llvm/lib/Target/X86/X86RegisterInfo.h
    M llvm/unittests/Target/AArch64/AArch64RegisterInfoTest.cpp

  Log Message:
  -----------
  [CodeGen] Use SmallSetVector for getRegAllocationHints (#224472)

Change `TargetRegisterInfo::getRegAllocationHints` and all target
overrides to accept `SmallSetVector<MCPhysReg, 16> &Hints` instead of
`SmallVectorImpl`, structurally preventing duplicate register allocation
hints while preserving insertion order.

Assisted-by: Gemini
Link: #190139
Link: #193011
Link: #219007
Link: #224448
Link: #224451
Link: #224742



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