Add a test

Author: s-barannikov

llvm/test/TableGen/FixedLenDecoderEmitter/big-filter.td

@@ -0,0 +1,40 @@
+// RUN: llvm-tblgen -gen-disassembler -I %p/../../../include %s | FileCheck %s
+
+include "llvm/Target/Target.td"
+
+class I : Instruction {
+  let InOperandList = (ins);
+  let OutOperandList = (outs);
+  let Size = 16;
+  bits<128> Inst;
+}
+
+// Check that a 64-bit filter with all bits set does not confuse DecoderEmitter.
+//
+// CHECK-LABEL: static const uint8_t DecoderTable128[] = {
+// CHECK-NEXT:    MCD::OPC_ExtractField, 0, 64,
+// CHECK-NEXT:    MCD::OPC_FilterValue, 1, 8, 0,
+// CHECK-NEXT:    MCD::OPC_CheckFieldOrFail, 127, 1, 1,
+// CHECK-NEXT:    MCD::OPC_Decode, 187, 2, 0,
+// CHECK-NEXT:    MCD::OPC_FilterValueOrFail, 255, 255, 255, 255, 255, 255, 255, 255, 255, 1,
+// CHECK-NEXT:    MCD::OPC_CheckFieldOrFail, 127, 1, 0,
+// CHECK-NEXT:    MCD::OPC_Decode, 186, 2, 0,
+// CHECK-NEXT:    MCD::OPC_Fail,
+// CHECK-NEXT:    0
+// CHECK-NEXT:  };
+
+def I1 : I {
+  let Inst{63...0} = -1;
+  let Inst{127} = 0;
+}
+
+def I2 : I {
+  let Inst{63...0} = 1;
+  let Inst{127} = 1;
+}
+
+def II : InstrInfo;
+
+def MyTarget : Target {
+  let InstructionSet = II;
+}