From c91e8c746445f7ba2656f86685507ea61454194d Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 27 Jun 2009 04:06:41 +0000
Subject: When doing remat, don't consider uses of non-allocatable physregs. 
 Patch by Evan.

llvm-svn: 74370
---
 llvm/lib/CodeGen/LiveIntervalAnalysis.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'llvm/lib')

diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index d6931df896d..21bb5dc0127 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -947,6 +947,10 @@ unsigned LiveIntervals::getReMatImplicitUse(const LiveInterval &li,
     unsigned Reg = MO.getReg();
     if (Reg == 0 || Reg == li.reg)
       continue;
+    
+    if (TargetRegisterInfo::isPhysicalRegister(Reg) &&
+        !allocatableRegs_[Reg])
+      continue;
     // FIXME: For now, only remat MI with at most one register operand.
     assert(!RegOp &&
            "Can't rematerialize instruction with multiple register operand!");
-- 
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