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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-28 02:08:50 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-28 02:08:50 +0000 |
| commit | 2129a0f6773b3625ddc5d541fe454a9a923cec2a (patch) | |
| tree | c61a1c946d40030eeba132f3a885f2678818fce4 /lib/CodeGen | |
| parent | 33177f591a46e2a476fe8ab49f7055532b48fd40 (diff) | |
| download | external_llvm-2129a0f6773b3625ddc5d541fe454a9a923cec2a.zip external_llvm-2129a0f6773b3625ddc5d541fe454a9a923cec2a.tar.gz external_llvm-2129a0f6773b3625ddc5d541fe454a9a923cec2a.tar.bz2 | |
Handle regmasks in MachineCSE.
Don't attempt to extend physreg live ranges across calls.
<rdar://problem/10942095>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151610 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index 491a22c..27226f1 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/lib/CodeGen/MachineCSE.cpp @@ -170,6 +170,8 @@ MachineCSE::isPhysDefTriviallyDead(unsigned Reg, bool SeenDef = false; for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) { const MachineOperand &MO = I->getOperand(i); + if (MO.isRegMask() && MO.clobbersPhysReg(Reg)) + SeenDef = true; if (!MO.isReg() || !MO.getReg()) continue; if (!TRI->regsOverlap(MO.getReg(), Reg)) @@ -271,6 +273,10 @@ bool MachineCSE::PhysRegDefsReach(MachineInstr *CSMI, MachineInstr *MI, for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) { const MachineOperand &MO = I->getOperand(i); + // RegMasks go on instructions like calls that clobber lots of physregs. + // Don't attempt to CSE across such an instruction. + if (MO.isRegMask()) + return false; if (!MO.isReg() || !MO.isDef()) continue; unsigned MOReg = MO.getReg(); |