Ignore non-allocatable physical registers in live interval analysis.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10449 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 2a31e66851..52cf73be8b 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -183,6 +183,10 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock* mbb,
                                               unsigned reg)
 {
     DEBUG(std::cerr << "\t\t\tregister: ";printRegName(reg); std::cerr << '\n');
+    if (!lv_->getAllocatablePhysicalRegisters()[reg]) {
+        DEBUG(std::cerr << "\t\t\t\tnon allocatable register: ignoring\n");
+        return;
+    }
 
     unsigned start = getInstructionIndex(*mi);
     unsigned end = start;