Add instruction flags: hasExtraSrcRegAllocReq and hasExtraDefRegAllocReq. When

set, these flags indicate the instructions source / def operands have special
register allocation requirement that are not captured in their register classes.
Post-allocation passes (e.g. post-alloc scheduler) should not change their
allocations. e.g. ARM::LDRD require the two definitions to be allocated
even / odd register pair.

llvm-svn: 83196

3 files changed, 6 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/CodeGenInstruction.cpp b/llvm/utils/TableGen/CodeGenInstruction.cpp
index b7968a0e9cd..d421fd07c32 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.cpp
+++ b/llvm/utils/TableGen/CodeGenInstruction.cpp
@@ -101,6 +101,8 @@ CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
   mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects");
   neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
   isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
+  hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
+  hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
   hasOptionalDef = false;
   isVariadic = false;
 
diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index f4afd5e45ba..04506e9d2d8 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -106,6 +106,8 @@ namespace llvm {
     bool mayHaveSideEffects;
     bool neverHasSideEffects;
     bool isAsCheapAsAMove;
+    bool hasExtraSrcRegAllocReq;
+    bool hasExtraDefRegAllocReq;
     
     /// ParseOperandName - Parse an operand name like "$foo" or "$foo.bar",
     /// where $foo is a whole operand and $foo.bar refers to a suboperand.
diff --git a/llvm/utils/TableGen/InstrInfoEmitter.cpp b/llvm/utils/TableGen/InstrInfoEmitter.cpp
index c28180b184f..3a104ea3587 100644
--- a/llvm/utils/TableGen/InstrInfoEmitter.cpp
+++ b/llvm/utils/TableGen/InstrInfoEmitter.cpp
@@ -280,6 +280,8 @@ void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
   if (Inst.isVariadic)         OS << "|(1<<TID::Variadic)";
   if (Inst.hasSideEffects)     OS << "|(1<<TID::UnmodeledSideEffects)";
   if (Inst.isAsCheapAsAMove)   OS << "|(1<<TID::CheapAsAMove)";
+  if (Inst.hasExtraSrcRegAllocReq) OS << "|(1<<TID::ExtraSrcRegAllocReq)";
+  if (Inst.hasExtraDefRegAllocReq) OS << "|(1<<TID::ExtraDefRegAllocReq)";
   OS << ", 0";
 
   // Emit all of the target-specific flags...