[TableGen] Include schedule model name in diagnostic.

[simon_tatham]

Summary

If you have more than one schedule model in your TableGen target
definitions, then the diagnostic "No schedule information for
instruction 'foo'" is rather unhelpful, because it doesn't tell you
_which_ schedule model is missing the necessary information (or, as it
might be, missing the UnsupportedFeatures definition that would stop
it thinking it needed it).

Extended the message to include the name of the schedule model that
it's complaining about.

[javed.absar]

llvm/test/TableGen/SchedModelError.td

8

Perhaps 's/model/SchedMachineModel/', but i am also happy with your changes as it is.

[simon_tatham]

Adjusted message wording as suggested.

llvm/test/TableGen/SchedModelError.td

+// RUN: not llvm-tblgen -gen-subtarget -I %p/../../include %s 2>&1 | FileCheck %s -DFILE=%s
+
+include "llvm/Target/Target.td"
+
+def TestTarget : Target;
+
+// CHECK: [[FILE]]:[[@LINE+1]]:1: error: No schedule information for instruction 'TestInst' in SchedMachineModel 'TestSchedModel'
+def TestInst : Instruction {
+  let OutOperandList = (outs);
+  let InOperandList = (ins);
+  bits<8> Inst = 0b00101010;
+}
+
+def TestSchedModel : SchedMachineModel {
+  let CompleteModel = 1;
+}
+
+def TestProcessor : ProcessorModel<"testprocessor", TestSchedModel, []>;

llvm/utils/TableGen/CodeGenSchedule.cpp

for (const CodeGenInstruction *Inst : Target.getInstructionsByEnumValue()) {
         continue;
       if (ProcModel.isUnsupported(*Inst))
         continue;
       unsigned SCIdx = getSchedClassIdx(*Inst);
       if (!SCIdx) {
         if (Inst->TheDef->isValueUnset("SchedRW") && !HadCompleteModel) {
           PrintError(Inst->TheDef->getLoc(),
                      "No schedule information for instruction '" +
-                         Inst->TheDef->getName() + "'");
+                         Inst->TheDef->getName() + "' in SchedMachineModel '" +
+                     ProcModel.ModelDef->getName() + "'");
           Complete = false;
         }
         continue;
       }
 
       const CodeGenSchedClass &SC = getSchedClass(SCIdx);
       if (!SC.Writes.empty())
         continue;