vendor/llvm/llvm-trunk-r300422

1 files changed, 11 insertions, 1 deletions

diff --git a/lib/Target/Hexagon/RDFDeadCode.cpp b/lib/Target/Hexagon/RDFDeadCode.cpp
index 63177d51cada..9aa8ad68e07e 100644
--- a/lib/Target/Hexagon/RDFDeadCode.cpp
+++ b/lib/Target/Hexagon/RDFDeadCode.cpp
@@ -62,9 +62,19 @@ bool DeadCodeElimination::isLiveInstr(const MachineInstr *MI) const {
     return true;
   if (MI->isPHI())
     return false;
-  for (auto &Op : MI->operands())
+  for (auto &Op : MI->operands()) {
     if (Op.isReg() && MRI.isReserved(Op.getReg()))
       return true;
+    if (Op.isRegMask()) {
+      const uint32_t *BM = Op.getRegMask();
+      for (unsigned R = 0, RN = DFG.getTRI().getNumRegs(); R != RN; ++R) {
+        if (BM[R/32] & (1u << (R%32)))
+          continue;
+        if (MRI.isReserved(R))
+          return true;
+      }
+    }
+  }
   return false;
 }