diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/RegisterScavenging.cpp')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/RegisterScavenging.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/contrib/llvm/lib/CodeGen/RegisterScavenging.cpp b/contrib/llvm/lib/CodeGen/RegisterScavenging.cpp index ebfe533..9e9a145 100644 --- a/contrib/llvm/lib/CodeGen/RegisterScavenging.cpp +++ b/contrib/llvm/lib/CodeGen/RegisterScavenging.cpp @@ -154,13 +154,16 @@ void RegScavenger::forward() { BitVector DeadRegs(NumPhysRegs); for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { const MachineOperand &MO = MI->getOperand(i); - if (!MO.isReg() || MO.isUndef()) + if (!MO.isReg()) continue; unsigned Reg = MO.getReg(); if (!Reg || isReserved(Reg)) continue; if (MO.isUse()) { + // Ignore undef uses. + if (MO.isUndef()) + continue; // Two-address operands implicitly kill. if (!isPred && (MO.isKill() || MI->isRegTiedToDefOperand(i))) addRegWithSubRegs(KillRegs, Reg); @@ -178,12 +181,14 @@ void RegScavenger::forward() { // Verify uses and defs. for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { const MachineOperand &MO = MI->getOperand(i); - if (!MO.isReg() || MO.isUndef()) + if (!MO.isReg()) continue; unsigned Reg = MO.getReg(); if (!Reg || isReserved(Reg)) continue; if (MO.isUse()) { + if (MO.isUndef()) + continue; if (!isUsed(Reg)) { // Check if it's partial live: e.g. // D0 = insert_subreg D0<undef>, S0 |
