Revert "AMDGPU: Remove unused control flow intrinsic"

llvm-svn: 274978

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp b/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
index 1ba14cd..3d6fc9e 100644
--- a/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
+++ b/llvm/lib/Target/AMDGPU/SILowerControlFlow.cpp
@@ -80,6 +80,7 @@ private:
 
   void If(MachineInstr &MI);
   void Else(MachineInstr &MI, bool ExecModified);
+  void Break(MachineInstr &MI);
   void IfBreak(MachineInstr &MI);
   void ElseBreak(MachineInstr &MI);
   void Loop(MachineInstr &MI);
@@ -276,6 +277,20 @@ void SILowerControlFlow::Else(MachineInstr &MI, bool ExecModified) {
   MI.eraseFromParent();
 }
 
+void SILowerControlFlow::Break(MachineInstr &MI) {
+  MachineBasicBlock &MBB = *MI.getParent();
+  DebugLoc DL = MI.getDebugLoc();
+
+  unsigned Dst = MI.getOperand(0).getReg();
+  unsigned Src = MI.getOperand(1).getReg();
+
+  BuildMI(MBB, &MI, DL, TII->get(AMDGPU::S_OR_B64), Dst)
+          .addReg(AMDGPU::EXEC)
+          .addReg(Src);
+
+  MI.eraseFromParent();
+}
+
 void SILowerControlFlow::IfBreak(MachineInstr &MI) {
   MachineBasicBlock &MBB = *MI.getParent();
   DebugLoc DL = MI.getDebugLoc();
@@ -661,6 +676,10 @@ bool SILowerControlFlow::runOnMachineFunction(MachineFunction &MF) {
           Else(MI, ExecModified);
           break;
 
+        case AMDGPU::SI_BREAK:
+          Break(MI);
+          break;
+
         case AMDGPU::SI_IF_BREAK:
           IfBreak(MI);
           break;