From a09d18deb00bebf2376ff45a8e4769376ba7a135 Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Sat, 9 Sep 2017 00:52:45 +0000
Subject: [PATCH] RegAllocFast: Move vector to class level to avoid
 reallocation; NFC

llvm-svn: 312845
---
 llvm/lib/CodeGen/RegAllocFast.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
index ae0114f326f0..ef3cc16cd053 100644
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -112,6 +112,9 @@ namespace {
     // PhysRegState - One of the RegState enums, or a virtreg.
     std::vector<unsigned> PhysRegState;
 
+    SmallVector<unsigned, 16> VirtDead;
+    SmallVector<MachineInstr*, 32> Coalesced;
+
     // Set of register units.
     typedef SparseSet<unsigned> UsedInInstrSet;
 
@@ -810,8 +813,8 @@ void RAFast::AllocateBasicBlock() {
     if (MRI->isAllocatable(LI.PhysReg))
       definePhysReg(*MII, LI.PhysReg, regReserved);
 
-  SmallVector<unsigned, 8> VirtDead;
-  SmallVector<MachineInstr*, 32> Coalesced;
+  VirtDead.clear();
+  Coalesced.clear();
 
   // Otherwise, sequentially allocate each instruction in the MBB.
   while (MII != MBB->end()) {