1 files changed, 81 insertions, 0 deletions
diff --git a/llvm/test/TableGen/HwModeEncodeDecode.td b/llvm/test/TableGen/HwModeEncodeDecode.td
new file mode 100644
index 00000000000..b76d8564651
--- /dev/null
+++ b/llvm/test/TableGen/HwModeEncodeDecode.td
@@ -0,0 +1,81 @@
+// RUN: llvm-tblgen -gen-emitter -I %p/../../include %s | FileCheck %s --check-prefix=ENCODER
+// RUN: llvm-tblgen -gen-disassembler -I %p/../../include %s | FileCheck %s --check-prefix=DECODER
+
+include "llvm/Target/Target.td"
+
+def archInstrInfo : InstrInfo { }
+
+def arch : Target {
+    let InstructionSet = archInstrInfo;
+}
+
+def  Myi32  : Operand<i32> {
+  let DecoderMethod = "DecodeMyi32";
+}
+
+def ModeA : HwMode<"+a">;
+def ModeB : HwMode<"+b">;
+
+
+def fooTypeEncA : InstructionEncoding {
+  let Size = 4;
+  field bits<32> SoftFail = 0;
+  bits<32> Inst;
+  bits<8> factor;
+  let Inst{7-0} = factor;
+  let Inst{3-2} = 0b11;
+  let Inst{1-0} = 0b00;
+}
+
+def fooTypeEncB : InstructionEncoding {
+  let Size = 4;
+  field bits<32> SoftFail = 0;
+  bits<32> Inst;
+  bits<8> factor;
+  let Inst{15-8} = factor;
+  let Inst{1-0} = 0b11;
+}
+
+let OutOperandList = (outs) in {
+def foo : Instruction {
+  let InOperandList = (ins i32imm:$factor);
+  let EncodingInfos = EncodingByHwMode<
+    [ModeA, ModeB], [fooTypeEncA,
+                      fooTypeEncB]
+  >;
+  let AsmString = "foo  $factor";
+}
+
+def bar: Instruction {
+  let InOperandList = (ins i32imm:$factor);
+  let Size = 4;
+  bits<32> Inst;
+  bits<32> SoftFail;
+  bits<8> factor;
+  let Inst{31-24} = factor;
+  let Inst{1-0} = 0b10;
+  let AsmString = "bar  $factor";
+}
+}
+
+// DECODER-LABEL: DecoderTable_ModeA32[] =
+// DECODER-DAG: Opcode: fooTypeEncA:foo
+// DECODER-DAG: Opcode: bar
+// DECODER-LABEL: DecoderTable_ModeB32[] =
+// Note that the comment says fooTypeEncA but this is actually fooTypeEncB; plumbing
+// the correct comment text through the decoder is nontrivial.
+// DECODER-DAG: Opcode: fooTypeEncA:foo
+// DECODER-DAG: Opcode: bar
+
+// ENCODER-LABEL:   static const uint64_t InstBits_ModeA[] = {
+// ENCODER:         UINT64_C(2),        // bar
+// ENCODER:         UINT64_C(12),       // foo
+
+// ENCODER-LABEL:   static const uint64_t InstBits_ModeB[] = {
+// ENCODER:         UINT64_C(2),        // bar
+// ENCODER:         UINT64_C(3),        // foo
+
+// ENCODER:     case ::foo: {
+// ENCODER:      switch (HwMode) {
+// ENCODER:      default: llvm_unreachable("Unhandled HwMode");
+// ENCODER:      case 1: {