Pool-allocation for MachineInstrs, MachineBasicBlocks, and

MachineMemOperands. The pools are owned by MachineFunctions.

This drastically reduces the number of calls to malloc/free made
during the "Emit" phase of scheduling, as well as later phases
in CodeGen. Combined with other changes, this speeds up the
"instruction selection" phase of CodeGen by 10% in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53212 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 87a77bb14f..f6b3d9cada 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -127,7 +127,7 @@ void BranchFolder::RemoveDeadBlock(MachineBasicBlock *MBB) {
   }
   
   // Remove the block.
-  MF->getBasicBlockList().erase(MBB);
+  MF->erase(MBB);
 }
 
 /// OptimizeImpDefsBlock - If a basic block is just a bunch of implicit_def
@@ -375,10 +375,12 @@ void BranchFolder::ReplaceTailWithBranchTo(MachineBasicBlock::iterator OldInst,
 /// iterator.  This returns the new MBB.
 MachineBasicBlock *BranchFolder::SplitMBBAt(MachineBasicBlock &CurMBB,
                                             MachineBasicBlock::iterator BBI1) {
+  MachineFunction &MF = *CurMBB.getParent();
+
   // Create the fall-through block.
   MachineFunction::iterator MBBI = &CurMBB;
-  MachineBasicBlock *NewMBB = new MachineBasicBlock(CurMBB.getBasicBlock());
-  CurMBB.getParent()->getBasicBlockList().insert(++MBBI, NewMBB);
+  MachineBasicBlock *NewMBB =MF.CreateMachineBasicBlock(CurMBB.getBasicBlock());
+  CurMBB.getParent()->insert(++MBBI, NewMBB);
 
   // Move all the successors of this block to the specified block.
   NewMBB->transferSuccessors(&CurMBB);