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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-05-02 20:06:28 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-05-02 20:06:28 +0000 |
| commit | 2048e4ab7fb4ed45bae2159bae600ddf610303b1 (patch) | |
| tree | 76f4673e8dab9d6c4c8bab27e8f88a41461f169e /lib/CodeGen/RegisterScavenging.cpp | |
| parent | 8ce864e32458c6ca8b109bd7d3f002b8df34b6d3 (diff) | |
| download | llvm-2048e4ab7fb4ed45bae2159bae600ddf610303b1.tar.gz llvm-2048e4ab7fb4ed45bae2159bae600ddf610303b1.tar.bz2 llvm-2048e4ab7fb4ed45bae2159bae600ddf610303b1.tar.xz | |
Only ignore <undef> use operands, keep the <def,undef> ops.
Def operands may also have an <undef> flag, but that just means that a
sub-register redef doesn't actually read the super-register. For physical
registers, it has no meaning.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130714 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegisterScavenging.cpp')
| -rw-r--r-- | lib/CodeGen/RegisterScavenging.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp index ebfe533838..e2c25aba02 100644 --- a/lib/CodeGen/RegisterScavenging.cpp +++ b/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); |