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, 3 insertions, 4 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp b/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
index e241dd8fe4b..9e0086b7908 100644
--- a/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
@@ -237,11 +237,10 @@ static bool foldVGPRCopyIntoRegSequence(MachineInstr &MI,
 }
 
 bool SIFixSGPRCopies::runOnMachineFunction(MachineFunction &MF) {
+  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
   MachineRegisterInfo &MRI = MF.getRegInfo();
-  const SIRegisterInfo *TRI =
-      static_cast<const SIRegisterInfo *>(MF.getSubtarget().getRegisterInfo());
-  const SIInstrInfo *TII =
-      static_cast<const SIInstrInfo *>(MF.getSubtarget().getInstrInfo());
+  const SIRegisterInfo *TRI = ST.getRegisterInfo();
+  const SIInstrInfo *TII = ST.getInstrInfo();
 
   SmallVector<MachineInstr *, 16> Worklist;