resolve fixme: we now infer the instruction-level 'isvariadic' bit

from the pattern if present, and we use it instead of the bit.

llvm-svn: 98938

2 files changed, 21 insertions, 12 deletions

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 3e1b5dabba5..e09a10103de 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -1957,10 +1957,12 @@ class InstAnalyzer {
   bool &mayStore;
   bool &mayLoad;
   bool &HasSideEffects;
+  bool &IsVariadic;
 public:
   InstAnalyzer(const CodeGenDAGPatterns &cdp,
-               bool &maystore, bool &mayload, bool &hse)
-    : CDP(cdp), mayStore(maystore), mayLoad(mayload), HasSideEffects(hse){
+               bool &maystore, bool &mayload, bool &hse, bool &isv)
+    : CDP(cdp), mayStore(maystore), mayLoad(mayload), HasSideEffects(hse),
+      IsVariadic(isv) {
   }
 
   /// Analyze - Analyze the specified instruction, returning true if the
@@ -2009,6 +2011,7 @@ private:
     if (OpInfo.hasProperty(SDNPMayStore)) mayStore = true;
     if (OpInfo.hasProperty(SDNPMayLoad)) mayLoad = true;
     if (OpInfo.hasProperty(SDNPSideEffect)) HasSideEffects = true;
+    if (OpInfo.hasProperty(SDNPVariadic)) IsVariadic = true;
 
     if (const CodeGenIntrinsic *IntInfo = N->getIntrinsicInfo(CDP)) {
       // If this is an intrinsic, analyze it.
@@ -2028,12 +2031,13 @@ private:
 
 static void InferFromPattern(const CodeGenInstruction &Inst,
                              bool &MayStore, bool &MayLoad,
-                             bool &HasSideEffects,
+                             bool &HasSideEffects, bool &IsVariadic,
                              const CodeGenDAGPatterns &CDP) {
-  MayStore = MayLoad = HasSideEffects = false;
+  MayStore = MayLoad = HasSideEffects = IsVariadic = false;
 
   bool HadPattern =
-    InstAnalyzer(CDP, MayStore, MayLoad, HasSideEffects).Analyze(Inst.TheDef);
+    InstAnalyzer(CDP, MayStore, MayLoad, HasSideEffects, IsVariadic)
+    .Analyze(Inst.TheDef);
 
   // InstAnalyzer only correctly analyzes mayStore/mayLoad so far.
   if (Inst.mayStore) {  // If the .td file explicitly sets mayStore, use it.
@@ -2071,6 +2075,9 @@ static void InferFromPattern(const CodeGenInstruction &Inst,
               "which already inferred this.\n", Inst.TheDef->getName().c_str());
     HasSideEffects = true;
   }
+  
+  if (Inst.isVariadic)
+    IsVariadic = true;  // Can warn if we want.
 }
 
 /// ParseInstructions - Parse all of the instructions, inlining and resolving
@@ -2377,11 +2384,13 @@ void CodeGenDAGPatterns::InferInstructionFlags() {
     CodeGenInstruction &InstInfo =
       const_cast<CodeGenInstruction &>(*Instructions[i]);
     // Determine properties of the instruction from its pattern.
-    bool MayStore, MayLoad, HasSideEffects;
-    InferFromPattern(InstInfo, MayStore, MayLoad, HasSideEffects, *this);
+    bool MayStore, MayLoad, HasSideEffects, IsVariadic;
+    InferFromPattern(InstInfo, MayStore, MayLoad, HasSideEffects, IsVariadic,
+                     *this);
     InstInfo.mayStore = MayStore;
     InstInfo.mayLoad = MayLoad;
     InstInfo.hasSideEffects = HasSideEffects;
+    InstInfo.isVariadic = IsVariadic;
   }
 }
 
diff --git a/llvm/utils/TableGen/DAGISelMatcherGen.cpp b/llvm/utils/TableGen/DAGISelMatcherGen.cpp
index d0938378291..0c0b7265e5f 100644
--- a/llvm/utils/TableGen/DAGISelMatcherGen.cpp
+++ b/llvm/utils/TableGen/DAGISelMatcherGen.cpp
@@ -734,12 +734,12 @@ EmitResultInstructionAsOperand(const TreePatternNode *N,
     }
   }
 
-  // FIXME2: Instead of using the isVariadic flag on the instruction, we should
-  // have an SDNP that indicates variadicism.  The TargetInstrInfo isVariadic
-  // property should be inferred from this when an instruction has a pattern.
+  // If this is the root of the pattern and the pattern we're matching includes
+  // a node that is variadic, mark the generated node as variadic so that it
+  // gets the excess operands from the input DAG.
   int NumFixedArityOperands = -1;
-  if (N->NodeHasProperty(SDNPVariadic, CGP) ||
-      (isRoot && II.isVariadic))
+  if (isRoot &&
+      (Pattern.getSrcPattern()->NodeHasProperty(SDNPVariadic, CGP)))
     NumFixedArityOperands = Pattern.getSrcPattern()->getNumChildren();
   
   // If this is the root node and any of the nodes matched nodes in the input