Also compute MBB live-in lists in the new rewriter pass.

This deduplicates some code from the optimizing register allocators, and
it means that it is now possible to change the register allocators'
solutions simply by editing the VirtRegMap between the register
allocator pass and the rewriter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158249 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 45 deletions

diff --git a/lib/CodeGen/RegAllocPBQP.cpp b/lib/CodeGen/RegAllocPBQP.cpp
index 946d70e32f..2c58d7dda2 100644
--- a/lib/CodeGen/RegAllocPBQP.cpp
+++ b/lib/CodeGen/RegAllocPBQP.cpp
@@ -594,51 +594,6 @@ void RegAllocPBQP::finalizeAlloc() const {
 
     vrm->assignVirt2Phys(li->reg, physReg);
   }
-
-  // Finally iterate over the basic blocks to compute and set the live-in sets.
-  SmallVector<MachineBasicBlock*, 8> liveInMBBs;
-  MachineBasicBlock *entryMBB = &*mf->begin();
-
-  for (LIIterator liItr = lis->begin(), liEnd = lis->end();
-       liItr != liEnd; ++liItr) {
-
-    const LiveInterval *li = liItr->second;
-    unsigned reg = 0;
-
-    // Get the physical register for this interval
-    if (TargetRegisterInfo::isPhysicalRegister(li->reg)) {
-      reg = li->reg;
-    } else if (vrm->isAssignedReg(li->reg)) {
-      reg = vrm->getPhys(li->reg);
-    } else {
-      // Ranges which are assigned a stack slot only are ignored.
-      continue;
-    }
-
-    if (reg == 0) {
-      // Filter out zero regs - they're for intervals that were spilled.
-      continue;
-    }
-
-    // Iterate over the ranges of the current interval...
-    for (LRIterator lrItr = li->begin(), lrEnd = li->end();
-         lrItr != lrEnd; ++lrItr) {
-
-      // Find the set of basic blocks which this range is live into...
-      if (lis->findLiveInMBBs(lrItr->start, lrItr->end,  liveInMBBs)) {
-        // And add the physreg for this interval to their live-in sets.
-        for (unsigned i = 0; i != liveInMBBs.size(); ++i) {
-          if (liveInMBBs[i] != entryMBB) {
-            if (!liveInMBBs[i]->isLiveIn(reg)) {
-              liveInMBBs[i]->addLiveIn(reg);
-            }
-          }
-        }
-        liveInMBBs.clear();
-      }
-    }
-  }
-
 }
 
 bool RegAllocPBQP::runOnMachineFunction(MachineFunction &MF) {