From f858466018346e3b59acb9e3ac7dfd5ba4c0d0a9 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Mon, 23 Mar 2009 18:24:37 +0000
Subject: Fix PR3391 and PR3864. Reg allocator infinite looping.

llvm-svn: 67544
---
 llvm/lib/CodeGen/RegAllocLinearScan.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

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

diff --git a/llvm/lib/CodeGen/RegAllocLinearScan.cpp b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
index e8296a74775..912135a57f6 100644
--- a/llvm/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
@@ -869,8 +869,12 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
     if (cur->weight == HUGE_VALF ||
         li_->getApproximateInstructionCount(*cur) == 0) {
       // Spill a physical register around defs and uses.
-      li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_);
-      assignRegOrStackSlotAtInterval(cur);
+      if (li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_))
+        assignRegOrStackSlotAtInterval(cur);
+      else {
+        cerr << "Ran out of registers during register allocation!\n";
+        exit(1);
+      }
       return;
     }
   }
-- 
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