TableGen: Add intrinsic property for norecurse

Author: arsenm

llvm/include/llvm/IR/Intrinsics.td

@@ -139,6 +139,8 @@ def IntrNoReturn : IntrinsicProperty;
 // Applied by default.
 def IntrNoCallback : IntrinsicProperty<1>;
 
+def IntrNoRecurse : IntrinsicProperty;
+
 // IntrNoSync - Threads executing the intrinsic will not synchronize using
 // memory or other means. Applied by default.
 def IntrNoSync : IntrinsicProperty<1>;

llvm/test/TableGen/intrinsic-attrs.td

@@ -6,6 +6,8 @@ def int_random_gen   : Intrinsic<[llvm_i32_ty], [], [IntrNoMem, IntrHasSideEffec
 
 def int_deref_ptr_ret : Intrinsic<[llvm_ptr_ty], [], [Dereferenceable<RetIndex, 16>]>;
 
+def int_no_recurse   : Intrinsic<[llvm_i32_ty], [], [IntrNoRecurse]>;
+
 // CHECK: static AttributeSet getIntrinsicArgAttributeSet(LLVMContext &C, unsigned ID) {
 // CHECK-NEXT:   switch (ID) {
 // CHECK-NEXT: default: llvm_unreachable("Invalid attribute set number");
@@ -21,11 +23,17 @@ def int_deref_ptr_ret : Intrinsic<[llvm_ptr_ty], [], [Dereferenceable<RetIndex,
 // CHECK-NEXT: return AttributeSet::get(C, {
 // CHECK-NEXT: Attribute::get(C, Attribute::NoUnwind),
 // CHECK-NEXT: });
+// CHECK: case 1:
+// CHECK-NEXT: return AttributeSet::get(C, {
+// CHECK-NEXT: Attribute::get(C, Attribute::NoUnwind),
+// CHECK-NEXT: Attribute::get(C, Attribute::NoRecurse),
+// CHECK-NEXT: });
 
 
 // CHECK: getAttributes(LLVMContext &C, ID id)
 // CHECK: 0 << 8 | 0, // llvm.deref.ptr.ret
-// CHECK: 1 << 8 | 1, // llvm.random.gen
+// CHECK: 1 << 8 | 1, // llvm.no.recurse
+// CHECK: 2 << 8 | 1, // llvm.random.gen
 
 // CHECK: case 1:
 // CHECK-NEXT: return AttributeList::get(C, {

llvm/utils/TableGen/Basic/CodeGenIntrinsics.cpp

@@ -388,6 +388,8 @@ void CodeGenIntrinsic::setProperty(const Record *R) {
     isConvergent = true;
   else if (R->getName() == "IntrNoReturn")
     isNoReturn = true;
+  else if (R->getName() == "IntrNoRecurse")
+    isNoRecurse = true;
   else if (R->getName() == "IntrNoCallback")
     isNoCallback = true;
   else if (R->getName() == "IntrNoSync")

llvm/utils/TableGen/Basic/CodeGenIntrinsics.h

@@ -89,6 +89,9 @@ struct CodeGenIntrinsic {
   /// True if the intrinsic is no-return.
   bool isNoReturn = false;
 
+  /// True if the intrinsic is norecurse.
+  bool isNoRecurse = false;
+
   /// True if the intrinsic is no-callback.
   bool isNoCallback = false;
 

llvm/utils/TableGen/Basic/IntrinsicEmitter.cpp

@@ -416,9 +416,9 @@ static bool compareFnAttributes(const CodeGenIntrinsic *L,
   auto TieBoolAttributes = [](const CodeGenIntrinsic *I) -> auto {
     // Sort throwing intrinsics after non-throwing intrinsics.
     return std::tie(I->canThrow, I->isNoDuplicate, I->isNoMerge, I->isNoReturn,
-                    I->isNoCallback, I->isNoSync, I->isNoFree, I->isWillReturn,
-                    I->isCold, I->isConvergent, I->isSpeculatable,
-                    I->hasSideEffects, I->isStrictFP);
+                    I->isNoRecurse, I->isNoCallback, I->isNoSync, I->isNoFree,
+                    I->isWillReturn, I->isCold, I->isConvergent,
+                    I->isSpeculatable, I->hasSideEffects, I->isStrictFP);
   };
 
   auto TieL = TieBoolAttributes(L);
@@ -440,10 +440,11 @@ static bool compareFnAttributes(const CodeGenIntrinsic *L,
 /// NoUnwind = !canThrow, so we need to negate it's sense to test if the
 // intrinsic has NoUnwind attribute.
 static bool hasFnAttributes(const CodeGenIntrinsic &Int) {
-  return !Int.canThrow || Int.isNoReturn || Int.isNoCallback || Int.isNoSync ||
-         Int.isNoFree || Int.isWillReturn || Int.isCold || Int.isNoDuplicate ||
-         Int.isNoMerge || Int.isConvergent || Int.isSpeculatable ||
-         Int.isStrictFP || getEffectiveME(Int) != MemoryEffects::unknown();
+  return !Int.canThrow || Int.isNoReturn || Int.isNoRecurse ||
+         Int.isNoCallback || Int.isNoSync || Int.isNoFree || Int.isWillReturn ||
+         Int.isCold || Int.isNoDuplicate || Int.isNoMerge || Int.isConvergent ||
+         Int.isSpeculatable || Int.isStrictFP ||
+         getEffectiveME(Int) != MemoryEffects::unknown();
 }
 
 namespace {
@@ -572,6 +573,8 @@ static AttributeSet getIntrinsicFnAttributeSet(LLVMContext &C, unsigned ID) {
       addAttribute("NoUnwind");
     if (Int.isNoReturn)
       addAttribute("NoReturn");
+    if (Int.isNoRecurse)
+      addAttribute("NoRecurse");
     if (Int.isNoCallback)
       addAttribute("NoCallback");
     if (Int.isNoSync)