TableGen: Add hasNoSchedulingInfo to instructions

This introduces a new flag that indicates that a specific instruction
will never be present when the MachineScheduler runs and therefore needs
no scheduling information.

This is in preparation for an upcoming commit which checks completeness
of a scheduling model when tablegen runs.

Differential Revision: http://reviews.llvm.org/D17728

llvm-svn: 262383

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/include/llvm/Target/Target.td b/llvm/include/llvm/Target/Target.td
index 562bbfb8a98..654a008f660 100644
--- a/llvm/include/llvm/Target/Target.td
+++ b/llvm/include/llvm/Target/Target.td
@@ -427,6 +427,11 @@ class Instruction {
   // Is this instruction a pseudo instruction for use by the assembler parser.
   bit isAsmParserOnly = 0;
 
+  // This instruction is not expected to be queried for scheduling latencies
+  // and therefore needs no scheduling information even for a complete
+  // scheduling model.
+  bit hasNoSchedulingInfo = 0;
+
   InstrItinClass Itinerary = NoItinerary;// Execution steps used for scheduling.
 
   // Scheduling information from TargetSchedule.td.
@@ -765,7 +770,8 @@ class InstrInfo {
 // Standard Pseudo Instructions.
 // This list must match TargetOpcodes.h and CodeGenTarget.cpp.
 // Only these instructions are allowed in the TargetOpcode namespace.
-let isCodeGenOnly = 1, isPseudo = 1, Namespace = "TargetOpcode" in {
+let isCodeGenOnly = 1, isPseudo = 1, hasNoSchedulingInfo = 1,
+    Namespace = "TargetOpcode" in {
 def PHI : Instruction {
   let OutOperandList = (outs);
   let InOperandList = (ins variable_ops);
@@ -857,6 +863,7 @@ def COPY : Instruction {
   let AsmString = "";
   let hasSideEffects = 0;
   let isAsCheapAsAMove = 1;
+  let hasNoSchedulingInfo = 0;
 }
 def BUNDLE : Instruction {
   let OutOperandList = (outs);