[ARM GlobalISel] Remove C++ code for G_CONSTANT

Get rid of the handwritten instruction selector code for handling
G_CONSTANT. This code wasn't checking all the preconditions correctly
anyway, so it's better to leave it to TableGen, which can handle at
least some cases correctly (e.g. MOVi, MOVi16, folding into binary
operations). Also add tests to cover those cases.

llvm-svn: 318146

1 files changed, 0 insertions, 22 deletions

diff --git a/llvm/lib/Target/ARM/ARMInstructionSelector.cpp b/llvm/lib/Target/ARM/ARMInstructionSelector.cpp
index aee3d850c02..dd11b1d5f8d 100644
--- a/llvm/lib/Target/ARM/ARMInstructionSelector.cpp
+++ b/llvm/lib/Target/ARM/ARMInstructionSelector.cpp
@@ -796,28 +796,6 @@ bool ARMInstructionSelector::select(MachineInstr &I) const {
     I.setDesc(TII.get(ARM::ADDri));
     MIB.addImm(0).add(predOps(ARMCC::AL)).add(condCodeOp());
     break;
-  case G_CONSTANT: {
-    unsigned Reg = I.getOperand(0).getReg();
-
-    if (!validReg(MRI, Reg, 32, ARM::GPRRegBankID))
-      return false;
-
-    I.setDesc(TII.get(ARM::MOVi));
-    MIB.add(predOps(ARMCC::AL)).add(condCodeOp());
-
-    auto &Val = I.getOperand(1);
-    if (Val.isCImm()) {
-      if (Val.getCImm()->getBitWidth() > 32)
-        return false;
-      Val.ChangeToImmediate(Val.getCImm()->getZExtValue());
-    }
-
-    if (!Val.isImm()) {
-      return false;
-    }
-
-    break;
-  }
   case G_GLOBAL_VALUE:
     return selectGlobal(MIB, MRI);
   case G_STORE: