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| author | Arthur Eubanks <aeubanks@google.com> | 2023-07-27 13:27:58 -0700 |
|---|---|---|
| committer | Arthur Eubanks <aeubanks@google.com> | 2023-07-28 10:23:17 -0700 |
| commit | f800c1f3b207e7bcdc8b4c7192928d9a078242a0 (patch) | |
| tree | 79f77fff09c96bb166b2e9903b01501d33380cab /llvm/lib/CodeGen/PrologEpilogInserter.cpp | |
| parent | b5f7852c224e4ce7fd36f6f861c5d4e427254fbc (diff) | |
| download | llvm-f800c1f3b207e7bcdc8b4c7192928d9a078242a0.zip llvm-f800c1f3b207e7bcdc8b4c7192928d9a078242a0.tar.gz llvm-f800c1f3b207e7bcdc8b4c7192928d9a078242a0.tar.bz2 | |
[PEI] Don't zero out noreg operands
A tail call may have $noreg operands.
Fixes a crash.
Reviewed By: xgupta
Differential Revision: https://reviews.llvm.org/D156485
Diffstat (limited to 'llvm/lib/CodeGen/PrologEpilogInserter.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/PrologEpilogInserter.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp index ddf48c7..c2b2399 100644 --- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -1298,6 +1298,8 @@ void PEI::insertZeroCallUsedRegs(MachineFunction &MF) { continue; MCRegister Reg = MO.getReg(); + if (!Reg) + continue; // This picks up sibling registers (e.q. %al -> %ah). for (MCRegUnit Unit : TRI.regunits(Reg)) @@ -1321,8 +1323,11 @@ void PEI::insertZeroCallUsedRegs(MachineFunction &MF) { if (!MO.isReg()) continue; - for (const MCPhysReg &Reg : - TRI.sub_and_superregs_inclusive(MO.getReg())) + MCRegister Reg = MO.getReg(); + if (!Reg) + continue; + + for (const MCPhysReg Reg : TRI.sub_and_superregs_inclusive(Reg)) RegsToZero.reset(Reg); } } |