AMDGPU: Cleanup subtarget handling.

Split AMDGPUSubtarget into amdgcn/r600 specific subclasses.
This removes most of the static_casting of the basic codegen
classes everywhere, and tries to restrict the features
visible on the wrong target.

llvm-svn: 273652

1 files changed, 9 insertions, 3 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
index 37a47b4..1f3b361 100644
--- a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -11,6 +11,8 @@
 #include "SIInstrInfo.h"
 #include "SIMachineFunctionInfo.h"
 #include "SIRegisterInfo.h"
+#include "AMDGPUSubtarget.h"
+
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -52,10 +54,9 @@ void SIFrameLowering::emitPrologue(MachineFunction &MF,
   if (hasOnlySGPRSpills(MFI, MF.getFrameInfo()))
     return;
 
-  const SIInstrInfo *TII =
-      static_cast<const SIInstrInfo *>(MF.getSubtarget().getInstrInfo());
+  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
+  const SIInstrInfo *TII = ST.getInstrInfo();
   const SIRegisterInfo *TRI = &TII->getRegisterInfo();
-  const AMDGPUSubtarget &ST = MF.getSubtarget<AMDGPUSubtarget>();
   MachineRegisterInfo &MRI = MF.getRegInfo();
   MachineBasicBlock::iterator I = MBB.begin();
 
@@ -263,6 +264,11 @@ void SIFrameLowering::emitPrologue(MachineFunction &MF,
   }
 }
 
+void SIFrameLowering::emitEpilogue(MachineFunction &MF,
+                                   MachineBasicBlock &MBB) const {
+
+}
+
 void SIFrameLowering::processFunctionBeforeFrameFinalized(
   MachineFunction &MF,
   RegScavenger *RS) const {