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| author | Dimitry Andric <dim@FreeBSD.org> | 2017-05-16 19:46:52 +0000 |
|---|---|---|
| committer | Dimitry Andric <dim@FreeBSD.org> | 2017-05-16 19:46:52 +0000 |
| commit | 6b3f41ed88e8e440e11a4fbf20b6600529f80049 (patch) | |
| tree | 928b056f24a634d628c80238dbbf10d41b1a71d5 /lib/CodeGen/ExpandPostRAPseudos.cpp | |
| parent | c46e6a5940c50058e00c0c5f9123fd82e338d29a (diff) | |
| download | src-test2-e60cb5ab119b9a563b017aa95a500a9455152421.tar.gz src-test2-e60cb5ab119b9a563b017aa95a500a9455152421.zip | |
Diffstat (limited to 'lib/CodeGen/ExpandPostRAPseudos.cpp')
| -rw-r--r-- | lib/CodeGen/ExpandPostRAPseudos.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/CodeGen/ExpandPostRAPseudos.cpp b/lib/CodeGen/ExpandPostRAPseudos.cpp index ab2382e2db6d..e860906043dd 100644 --- a/lib/CodeGen/ExpandPostRAPseudos.cpp +++ b/lib/CodeGen/ExpandPostRAPseudos.cpp @@ -142,8 +142,9 @@ bool ExpandPostRA::LowerCopy(MachineInstr *MI) { MachineOperand &DstMO = MI->getOperand(0); MachineOperand &SrcMO = MI->getOperand(1); - if (SrcMO.getReg() == DstMO.getReg()) { - DEBUG(dbgs() << "identity copy: " << *MI); + bool IdentityCopy = (SrcMO.getReg() == DstMO.getReg()); + if (IdentityCopy || SrcMO.isUndef()) { + DEBUG(dbgs() << (IdentityCopy ? "identity copy: " : "undef copy: ") << *MI); // No need to insert an identity copy instruction, but replace with a KILL // if liveness is changed. if (SrcMO.isUndef() || MI->getNumOperands() > 2) { |