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
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 2a31e66..52cf73b 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -183,6 +183,10 @@
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;