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[RegAlloc] Constrain rematted regclass to use #164386

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Merged
merged 4 commits into from
Oct 23, 2025
Merged

[RegAlloc] Constrain rematted regclass to use #164386

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d1cfa18
[RegAlloc] Constrain rematted regclass to use
lukel97 Oct 21, 2025
de1db23
Remove uselist, datalayout, intrinsic declares
lukel97 Oct 22, 2025
24429d6
Add nounwind
lukel97 Oct 23, 2025
8b74e2e
Merge branch 'main' into regalloc/constrain-rematted-regclass
lukel97 Oct 23, 2025
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3 changes: 3 additions & 0 deletions llvm/lib/CodeGen/InlineSpiller.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -721,6 +721,9 @@ bool InlineSpiller::reMaterializeFor(LiveInterval &VirtReg, MachineInstr &MI) {
// Allocate a new register for the remat.
Register NewVReg = Edit->createFrom(Original);

// Constrain it to the register class of MI.
MRI.constrainRegClass(NewVReg, MRI.getRegClass(VirtReg.reg()));

// Finally we can rematerialize OrigMI before MI.
SlotIndex DefIdx =
Edit->rematerializeAt(*MI.getParent(), MI, NewVReg, RM, TRI);
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