AMDGPU: remove a couple of unused variables

	lib/Target/AMDGPU/SIRegisterInfo.cpp: In member function 'void llvm::SIRegisterInfo::spillSGPR(llvm::MachineBasicBlock::iterator, int, llvm::RegScavenger*) const':
	lib/Target/AMDGPU/SIRegisterInfo.cpp:572:30: warning: variable 'SubRC' set but not used [-Wunused-but-set-variable]
	   const TargetRegisterClass *SubRC = nullptr;
	                              ^
	lib/Target/AMDGPU/SIRegisterInfo.cpp: In member function 'void llvm::SIRegisterInfo::restoreSGPR(llvm::MachineBasicBlock::iterator, int, llvm::RegScavenger*) const':
	lib/Target/AMDGPU/SIRegisterInfo.cpp:723:30: warning: variable 'SubRC' set but not used [-Wunused-but-set-variable]
	   const TargetRegisterClass *SubRC = nullptr;
	                              ^

The variable was assigned to, but never used.  The functions called did not
mutate state.  Simplify the logic and remove the variable.  Identified by gcc
5.4.0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288601 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AMDGPU/SIRegisterInfo.cpp b/lib/Target/AMDGPU/SIRegisterInfo.cpp
index 3c96cc2d7cad4475e044f315708cb5f227e25ba5..2898f68ead278eee9870870f771a1b8fdf471dd0 100644 (file)
--- a/lib/Target/AMDGPU/SIRegisterInfo.cpp
+++ b/lib/Target/AMDGPU/SIRegisterInfo.cpp
@@ -569,14 +569,8 @@ void SIRegisterInfo::spillSGPR(MachineBasicBlock::iterator MI,
     std::tie(EltSize, ScalarStoreOp) = getSpillEltSize(RC->getSize(), true);
   }
 
-  const TargetRegisterClass *SubRC = nullptr;
-  unsigned NumSubRegs = 1;
   ArrayRef<int16_t> SplitParts = getRegSplitParts(RC, EltSize);
-
-  if (!SplitParts.empty()) {
-    NumSubRegs = SplitParts.size();
-    SubRC = getSubRegClass(RC, SplitParts[0]);
-  }
+  unsigned NumSubRegs = SplitParts.empty() ? 1 : SplitParts.size();
 
   // SubReg carries the "Kill" flag when SubReg == SuperReg.
   unsigned SubKillState = getKillRegState((NumSubRegs == 1) && IsKill);
@@ -720,14 +714,8 @@ void SIRegisterInfo::restoreSGPR(MachineBasicBlock::iterator MI,
     std::tie(EltSize, ScalarLoadOp) = getSpillEltSize(RC->getSize(), false);
   }
 
-  const TargetRegisterClass *SubRC = nullptr;
-  unsigned NumSubRegs = 1;
   ArrayRef<int16_t> SplitParts = getRegSplitParts(RC, EltSize);
-
-  if (!SplitParts.empty()) {
-    NumSubRegs = SplitParts.size();
-    SubRC = getSubRegClass(RC, SplitParts[0]);
-  }
+  unsigned NumSubRegs = SplitParts.empty() ? 1 : SplitParts.size();
 
   // SubReg carries the "Kill" flag when SubReg == SuperReg.
   int64_t FrOffset = FrameInfo.getObjectOffset(Index);