[GlobalISel] Add a test for the tablegen selector emitter backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294075 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/TableGen/GlobalISelEmitter.td b/test/TableGen/GlobalISelEmitter.td
new file mode 100644 (file)
index 0000000..9a7fabb
--- /dev/null
+++ b/test/TableGen/GlobalISelEmitter.td
@@ -0,0 +1,56 @@
+// RUN: llvm-tblgen -gen-global-isel -I %p/../../include %s | FileCheck %s
+
+include "llvm/Target/Target.td"
+
+//===- Define the necessary boilerplate for our test target. --------------===//
+
+def MyTargetISA : InstrInfo;
+def MyTarget : Target { let InstructionSet = MyTargetISA; }
+
+def R0 : Register<"r0">;
+def GPR32 : RegisterClass<"MyTarget", [i32], 32, (add R0)>;
+
+class I<dag OOps, dag IOps, list<dag> Pat>
+  : Instruction {
+  let Namespace = "MyTarget";
+  let OutOperandList = OOps;
+  let InOperandList = IOps;
+  let Pattern = Pat;
+}
+
+//===- Test the function definition boilerplate. --------------------------===//
+
+// CHECK: bool MyTargetInstructionSelector::selectImpl(MachineInstr &I) const {
+// CHECK: const MachineRegisterInfo &MRI = I.getParent()->getParent()->getRegInfo();
+
+
+//===- Test a simple pattern with regclass operands. ----------------------===//
+
+// CHECK: if ((I.getOpcode() == TargetOpcode::G_ADD) &&
+// CHECK-NEXT: (((MRI.getType(I.getOperand(0).getReg()) == (LLT::scalar(32))) &&
+// CHECK-NEXT:  ((&RBI.getRegBankFromRegClass(MyTarget::GPR32RegClass) == RBI.getRegBank(I.getOperand(0).getReg(), MRI, TRI))))) &&
+// CHECK-NEXT: (((MRI.getType(I.getOperand(1).getReg()) == (LLT::scalar(32))) &&
+// CHECK-NEXT:  ((&RBI.getRegBankFromRegClass(MyTarget::GPR32RegClass) == RBI.getRegBank(I.getOperand(1).getReg(), MRI, TRI))))) &&
+// CHECK-NEXT: (((MRI.getType(I.getOperand(2).getReg()) == (LLT::scalar(32))) &&
+// CHECK-NEXT:  ((&RBI.getRegBankFromRegClass(MyTarget::GPR32RegClass) == RBI.getRegBank(I.getOperand(2).getReg(), MRI, TRI)))))) {
+
+// CHECK-NEXT:   I.setDesc(TII.get(MyTarget::ADD));
+// CHECK-NEXT:   constrainSelectedInstRegOperands(I, TII, TRI, RBI);
+// CHECK-NEXT:   return true;
+// CHECK-NEXT: }
+
+def ADD : I<(outs GPR32:$dst), (ins GPR32:$src1, GPR32:$src2),
+            [(set GPR32:$dst, (add GPR32:$src1, GPR32:$src2))]>;
+
+//===- Test a pattern with an MBB operand. --------------------------------===//
+
+// CHECK: if ((I.getOpcode() == TargetOpcode::G_BR) &&
+// CHECK-NEXT: (((I.getOperand(0).isMBB())))) {
+
+// CHECK-NEXT:   I.setDesc(TII.get(MyTarget::BR));
+// CHECK-NEXT:   constrainSelectedInstRegOperands(I, TII, TRI, RBI);
+// CHECK-NEXT:   return true;
+// CHECK-NEXT: }
+
+def BR : I<(outs), (ins unknown:$target),
+            [(br bb:$target)]>;