RegisterPressure: Simplify close{Top|Bottom}()

- There are no duplicate registers in LiveRegs list we are copying from
  and so we do not need to sort the registers.
- Simply use SmallVector::apend instead of a loop between begin() and end()
  with push_back().

Differential Revision: http://reviews.llvm.org/D12813

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247588 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/RegisterPressure.cpp b/lib/CodeGen/RegisterPressure.cpp
index 3456bb6f9f85d32866e90324cdbe9bc7f01993d1..237e465e906cec9b5c196b43754b30b3b73910cb 100644 (file)
--- a/lib/CodeGen/RegisterPressure.cpp
+++ b/lib/CodeGen/RegisterPressure.cpp
@@ -252,12 +252,7 @@ void RegPressureTracker::closeTop() {
   assert(P.LiveInRegs.empty() && "inconsistent max pressure result");
   P.LiveInRegs.reserve(LiveRegs.PhysRegs.size() + LiveRegs.VirtRegs.size());
   P.LiveInRegs.append(LiveRegs.PhysRegs.begin(), LiveRegs.PhysRegs.end());
-  for (SparseSet<unsigned>::const_iterator I =
-         LiveRegs.VirtRegs.begin(), E = LiveRegs.VirtRegs.end(); I != E; ++I)
-    P.LiveInRegs.push_back(*I);
-  std::sort(P.LiveInRegs.begin(), P.LiveInRegs.end());
-  P.LiveInRegs.erase(std::unique(P.LiveInRegs.begin(), P.LiveInRegs.end()),
-                     P.LiveInRegs.end());
+  P.LiveInRegs.append(LiveRegs.VirtRegs.begin(), LiveRegs.VirtRegs.end());
 }
 
 /// Set the boundary for the bottom of the region and summarize live outs.
@@ -270,12 +265,7 @@ void RegPressureTracker::closeBottom() {
   assert(P.LiveOutRegs.empty() && "inconsistent max pressure result");
   P.LiveOutRegs.reserve(LiveRegs.PhysRegs.size() + LiveRegs.VirtRegs.size());
   P.LiveOutRegs.append(LiveRegs.PhysRegs.begin(), LiveRegs.PhysRegs.end());
-  for (SparseSet<unsigned>::const_iterator I =
-         LiveRegs.VirtRegs.begin(), E = LiveRegs.VirtRegs.end(); I != E; ++I)
-    P.LiveOutRegs.push_back(*I);
-  std::sort(P.LiveOutRegs.begin(), P.LiveOutRegs.end());
-  P.LiveOutRegs.erase(std::unique(P.LiveOutRegs.begin(), P.LiveOutRegs.end()),
-                      P.LiveOutRegs.end());
+  P.LiveOutRegs.append(LiveRegs.VirtRegs.begin(), LiveRegs.VirtRegs.end());
 }
 
 /// Finalize the region boundaries and record live ins and live outs.