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| author | Dimitry Andric <dim@FreeBSD.org> | 2024-03-04 20:30:54 +0000 |
|---|---|---|
| committer | Dimitry Andric <dim@FreeBSD.org> | 2024-03-08 08:19:10 +0000 |
| commit | 961271f952fc390396f967d50903291e3e6c59c6 (patch) | |
| tree | 6db1ae7070fe436d1d91b20eda79c67abb9d3e87 | |
| parent | f5fca73651a39dd75683c0f2374ac2cb0d11e670 (diff) | |
| download | src-961271f952fc390396f967d50903291e3e6c59c6.tar.gz src-961271f952fc390396f967d50903291e3e6c59c6.zip | |
Merge commit f800c1f3b207 from llvm-project (by Arthur Eubanks):
[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
This should fix an assertion failure building qemu, specifically those
parts using -fzero-call-used-regs.
Reported by: Daniel Berrangé <dan-freebsd@berrange.com>
PR: 277474
MFC after: 3 days
(cherry picked from commit a39b3aa463f3474fabb3aedb5aecf943b54b4357)
| -rw-r--r-- | contrib/llvm-project/llvm/lib/CodeGen/PrologEpilogInserter.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/contrib/llvm-project/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/contrib/llvm-project/llvm/lib/CodeGen/PrologEpilogInserter.cpp index e323aaaeefaf..49047719fdaa 100644 --- a/contrib/llvm-project/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/contrib/llvm-project/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -1285,6 +1285,8 @@ 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)) @@ -1308,8 +1310,11 @@ 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); } } |