From 953393a72cc0819146d8ada5dc1b84653ecbc73b Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Tue, 14 Jul 2015 17:38:17 +0000
Subject: RAGreedy: Keep track of allocated PhysRegs internally

Do not use MachineRegisterInfo::setPhysRegUsed()/isPhysRegUsed()
anymore. This bitset changes function-global state and is set by the
VirtRegRewriter anyway.
Simply use a bitvector private to RAGreedy.

Differential Revision: http://reviews.llvm.org/D10910

llvm-svn: 242169
---
 llvm/lib/CodeGen/LiveRegMatrix.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'llvm/lib/CodeGen/LiveRegMatrix.cpp')

diff --git a/llvm/lib/CodeGen/LiveRegMatrix.cpp b/llvm/lib/CodeGen/LiveRegMatrix.cpp
index 154ce6fc122..9ea031d38d2 100644
--- a/llvm/lib/CodeGen/LiveRegMatrix.cpp
+++ b/llvm/lib/CodeGen/LiveRegMatrix.cpp
@@ -131,6 +131,14 @@ void LiveRegMatrix::unassign(LiveInterval &VirtReg) {
   DEBUG(dbgs() << '\n');
 }
 
+bool LiveRegMatrix::isPhysRegUsed(unsigned PhysReg) const {
+  for (MCRegUnitIterator Unit(PhysReg, TRI); Unit.isValid(); ++Unit) {
+    if (!Matrix[*Unit].empty())
+      return true;
+  }
+  return false;
+}
+
 bool LiveRegMatrix::checkRegMaskInterference(LiveInterval &VirtReg,
                                              unsigned PhysReg) {
   // Check if the cached information is valid.
-- 
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