LivePhysRegs: Skip reserved regs in computeLiveIns; NFCI
We do not track liveness of reserved registers so adding them to the
liveins list in computeLiveIns() was completely unnecessary.
llvm-svn: 303937
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp
index 025b9fc..03ceac1 100644
--- a/llvm/lib/CodeGen/BranchFolding.cpp
+++ b/llvm/lib/CodeGen/BranchFolding.cpp
@@ -153,13 +153,14 @@
TriedMerging.clear();
+ MachineRegisterInfo &MRI = MF.getRegInfo();
AfterBlockPlacement = AfterPlacement;
TII = tii;
TRI = tri;
MMI = mmi;
MLI = mli;
+ this->MRI = &MRI;
- MachineRegisterInfo &MRI = MF.getRegInfo();
UpdateLiveIns = MRI.tracksLiveness() && TRI->trackLivenessAfterRegAlloc(MF);
if (!UpdateLiveIns)
MRI.invalidateLiveness();
@@ -351,7 +352,7 @@
if (UpdateLiveIns) {
NewDest->clearLiveIns();
- computeLiveIns(LiveRegs, *TRI, *NewDest);
+ computeLiveIns(LiveRegs, *MRI, *NewDest);
}
++NumTailMerge;
@@ -388,7 +389,7 @@
MBBFreqInfo.setBlockFreq(NewMBB, MBBFreqInfo.getBlockFreq(&CurMBB));
if (UpdateLiveIns)
- computeLiveIns(LiveRegs, *TRI, *NewMBB);
+ computeLiveIns(LiveRegs, *MRI, *NewMBB);
// Add the new block to the funclet.
const auto &FuncletI = FuncletMembership.find(&CurMBB);