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| author | Matthias Braun <matze@braunis.de> | 2016-06-11 00:31:28 +0000 |
|---|---|---|
| committer | Matthias Braun <matze@braunis.de> | 2016-06-11 00:31:28 +0000 |
| commit | 959a8c974df3c0b9240172b685cd1563171b30a0 (patch) | |
| tree | a927eab535b160f0d80cdaae5b0a729780ca0ab4 /llvm/lib/CodeGen | |
| parent | 940f425a43a6d65ae27bcc9ada16b72ce6af3e50 (diff) | |
| download | bcm5719-llvm-959a8c974df3c0b9240172b685cd1563171b30a0.tar.gz bcm5719-llvm-959a8c974df3c0b9240172b685cd1563171b30a0.zip | |
LiveIntervalAnalysis: findLastUseBefore() must ignore undef uses.
undef uses are no real uses of a register and must be ignored by
findLastUseBefore() so that handleMove() does not produce invalid live
intervals in some cases.
This fixed http://llvm.org/PR28083
llvm-svn: 272446
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/LiveIntervalAnalysis.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp index 622b9c25d0e..1a8360b226b 100644 --- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -1314,6 +1314,8 @@ private: if (TargetRegisterInfo::isVirtualRegister(Reg)) { SlotIndex LastUse = Before; for (MachineOperand &MO : MRI.use_nodbg_operands(Reg)) { + if (MO.isUndef()) + continue; unsigned SubReg = MO.getSubReg(); if (SubReg != 0 && LaneMask != 0 && (TRI.getSubRegIndexLaneMask(SubReg) & LaneMask) == 0) @@ -1353,7 +1355,7 @@ private: // Check if MII uses Reg. for (MIBundleOperands MO(*MII); MO.isValid(); ++MO) - if (MO->isReg() && + if (MO->isReg() && !MO->isUndef() && TargetRegisterInfo::isPhysicalRegister(MO->getReg()) && TRI.hasRegUnit(MO->getReg(), Reg)) return Idx.getRegSlot(); |
