[AVX] Make Inits Foldable

Manage Inits in a FoldingSet.  This provides several benefits:

- Memory for Inits is properly managed

- Duplicate Inits are folded into Flyweights, saving memory

- It enforces const-correctness, protecting against certain classes
  of bugs

The above benefits allow Inits to be used in more contexts, which in
turn provides more dynamism to TableGen.  This enhanced capability
will be used by the AVX code generator to a fold common patterns
together.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134907 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 4 deletions

diff --git a/utils/TableGen/InstrInfoEmitter.cpp b/utils/TableGen/InstrInfoEmitter.cpp
index 18d4db080a..3dcdeaa911 100644
--- a/utils/TableGen/InstrInfoEmitter.cpp
+++ b/utils/TableGen/InstrInfoEmitter.cpp
@@ -61,7 +61,7 @@ InstrInfoEmitter::GetOperandInfo(const CodeGenInstruction &Inst) {
     // registers in their multi-operand operands.  It may also be an anonymous
     // operand, which has a single operand, but no declared class for the
     // operand.
-    DagInit *MIOI = Inst.Operands[i].MIOperandInfo;
+    const DagInit *MIOI = Inst.Operands[i].MIOperandInfo;
 
     if (!MIOI || MIOI->getNumArgs() == 0) {
       // Single, anonymous, operand.
@@ -70,7 +70,7 @@ InstrInfoEmitter::GetOperandInfo(const CodeGenInstruction &Inst) {
       for (unsigned j = 0, e = Inst.Operands[i].MINumOperands; j != e; ++j) {
         OperandList.push_back(Inst.Operands[i]);
 
-        Record *OpR = dynamic_cast<DefInit*>(MIOI->getArg(j))->getDef();
+        Record *OpR = dynamic_cast<const DefInit*>(MIOI->getArg(j))->getDef();
         OperandList.back().Rec = OpR;
       }
     }
@@ -288,11 +288,11 @@ void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
   if (Inst.hasExtraDefRegAllocReq) OS << "|(1<<MCID::ExtraDefRegAllocReq)";
 
   // Emit all of the target-specific flags...
-  BitsInit *TSF = Inst.TheDef->getValueAsBitsInit("TSFlags");
+  const BitsInit *TSF = Inst.TheDef->getValueAsBitsInit("TSFlags");
   if (!TSF) throw "no TSFlags?";
   uint64_t Value = 0;
   for (unsigned i = 0, e = TSF->getNumBits(); i != e; ++i) {
-    if (BitInit *Bit = dynamic_cast<BitInit*>(TSF->getBit(i)))
+    if (const BitInit *Bit = dynamic_cast<const BitInit*>(TSF->getBit(i)))
       Value |= uint64_t(Bit->getValue()) << i;
     else
       throw "Invalid TSFlags bit in " + Inst.TheDef->getName();