Hexagon: add support for predicate-GPR copies.

llvm-svn: 175102

llvm/lib/Target/Hexagon/HexagonInstrInfo.cpp

@@ -426,6 +426,18 @@ void HexagonInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
     BuildMI(MBB, I, DL, get(Hexagon::TFCR), DestReg).addReg(SrcReg);
     return;
   }
+  if (Hexagon::PredRegsRegClass.contains(SrcReg) &&
+      Hexagon::IntRegsRegClass.contains(DestReg)) {
+    BuildMI(MBB, I, DL, get(Hexagon::TFR_RsPd), DestReg).
+      addReg(SrcReg, getKillRegState(KillSrc));
+    return;
+  }
+  if (Hexagon::IntRegsRegClass.contains(SrcReg) &&
+      Hexagon::PredRegsRegClass.contains(DestReg)) {
+    BuildMI(MBB, I, DL, get(Hexagon::TFR_PdRs), DestReg).
+      addReg(SrcReg, getKillRegState(KillSrc));
+    return;
+  }
 
   llvm_unreachable("Unimplemented");
 }

llvm/test/CodeGen/Hexagon/predicate-copy.ll

@@ -0,0 +1,8 @@
+; RUN: llc -march=hexagon -mcpu=hexagonv4 -O3 < %s | FileCheck %s
+
+; CHECK: r{{[0-9]+}} = p{{[0-9]+}}
+define i1 @foo() {
+entry:
+  ret i1 false
+}
+