[IR] Reduce use of getCalledFunction in Verifier. NFCI. (#134978)

This is mostly just a simplification. getCalledFunction is a best-effort
thing so the verifier should not be relying on it in most cases, except
for intrinsic calls where we are guaranteed that the called function is
known, but most of those cases can be handled with
CallBase::getIntrinsicID instead.

---------

Co-authored-by: Tim Gymnich <[email protected]>

Author: jayfoad

llvm/lib/IR/Verifier.cpp

@@ -2629,9 +2629,7 @@ void Verifier::verifyInlineAsmCall(const CallBase &Call) {
 
 /// Verify that statepoint intrinsic is well formed.
 void Verifier::verifyStatepoint(const CallBase &Call) {
-  assert(Call.getCalledFunction() &&
-         Call.getCalledFunction()->getIntrinsicID() ==
-             Intrinsic::experimental_gc_statepoint);
+  assert(Call.getIntrinsicID() == Intrinsic::experimental_gc_statepoint);
 
   Check(!Call.doesNotAccessMemory() && !Call.onlyReadsMemory() &&
             !Call.onlyAccessesArgMemory(),
@@ -3635,8 +3633,7 @@ void Verifier::visitCallBase(CallBase &Call) {
   }
 
   if (Attrs.hasFnAttr(Attribute::Preallocated)) {
-    Check(Call.getCalledFunction()->getIntrinsicID() ==
-              Intrinsic::call_preallocated_arg,
+    Check(Call.getIntrinsicID() == Intrinsic::call_preallocated_arg,
           "preallocated as a call site attribute can only be on "
           "llvm.call.preallocated.arg");
   }
@@ -3734,9 +3731,7 @@ void Verifier::visitCallBase(CallBase &Call) {
 
       // Statepoint intrinsic is vararg but the wrapped function may be not.
       // Allow sret here and check the wrapped function in verifyStatepoint.
-      if (!Call.getCalledFunction() ||
-          Call.getCalledFunction()->getIntrinsicID() !=
-              Intrinsic::experimental_gc_statepoint)
+      if (Call.getIntrinsicID() != Intrinsic::experimental_gc_statepoint)
         Check(!ArgAttrs.hasAttribute(Attribute::StructRet),
               "Attribute 'sret' cannot be used for vararg call arguments!",
               Call);
@@ -3765,9 +3760,8 @@ void Verifier::visitCallBase(CallBase &Call) {
           "Return type cannot be x86_amx for indirect call!");
   }
 
-  if (Function *F = Call.getCalledFunction())
-    if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
-      visitIntrinsicCall(ID, Call);
+  if (Intrinsic::ID ID = Call.getIntrinsicID())
+    visitIntrinsicCall(ID, Call);
 
   // Verify that a callsite has at most one "deopt", at most one "funclet", at
   // most one "gc-transition", at most one "cfguardtarget", at most one
@@ -3980,7 +3974,7 @@ void Verifier::verifyMustTailCall(CallInst &CI) {
   // - The caller and callee prototypes must match.  Pointer types of
   //   parameters or return types may differ in pointee type, but not
   //   address space.
-  if (!CI.getCalledFunction() || !CI.getCalledFunction()->isIntrinsic()) {
+  if (!CI.getIntrinsicID()) {
     Check(CallerTy->getNumParams() == CalleeTy->getNumParams(),
           "cannot guarantee tail call due to mismatched parameter counts", &CI);
     for (unsigned I = 0, E = CallerTy->getNumParams(); I != E; ++I) {
@@ -5647,8 +5641,8 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
       auto *UseCall = dyn_cast<CallBase>(U);
       Check(UseCall != nullptr,
             "Uses of llvm.call.preallocated.setup must be calls");
-      const Function *Fn = UseCall->getCalledFunction();
-      if (Fn && Fn->getIntrinsicID() == Intrinsic::call_preallocated_arg) {
+      Intrinsic::ID IID = UseCall->getIntrinsicID();
+      if (IID == Intrinsic::call_preallocated_arg) {
         auto *AllocArgIndex = dyn_cast<ConstantInt>(UseCall->getArgOperand(1));
         Check(AllocArgIndex != nullptr,
               "llvm.call.preallocated.alloc arg index must be a constant");
@@ -5658,8 +5652,7 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
               "llvm.call.preallocated.alloc arg index must be between 0 and "
               "corresponding "
               "llvm.call.preallocated.setup's argument count");
-      } else if (Fn && Fn->getIntrinsicID() ==
-                           Intrinsic::call_preallocated_teardown) {
+      } else if (IID == Intrinsic::call_preallocated_teardown) {
         // nothing to do
       } else {
         Check(!FoundCall, "Can have at most one call corresponding to a "
@@ -5700,8 +5693,8 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
   }
   case Intrinsic::call_preallocated_arg: {
     auto *Token = dyn_cast<CallBase>(Call.getArgOperand(0));
-    Check(Token && Token->getCalledFunction()->getIntrinsicID() ==
-                       Intrinsic::call_preallocated_setup,
+    Check(Token &&
+              Token->getIntrinsicID() == Intrinsic::call_preallocated_setup,
           "llvm.call.preallocated.arg token argument must be a "
           "llvm.call.preallocated.setup");
     Check(Call.hasFnAttr(Attribute::Preallocated),
@@ -5711,8 +5704,8 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
   }
   case Intrinsic::call_preallocated_teardown: {
     auto *Token = dyn_cast<CallBase>(Call.getArgOperand(0));
-    Check(Token && Token->getCalledFunction()->getIntrinsicID() ==
-                       Intrinsic::call_preallocated_setup,
+    Check(Token &&
+              Token->getIntrinsicID() == Intrinsic::call_preallocated_setup,
           "llvm.call.preallocated.teardown token argument must be a "
           "llvm.call.preallocated.setup");
     break;
@@ -5804,11 +5797,8 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
 
     // Are we tied to a statepoint properly?
     const auto *StatepointCall = dyn_cast<CallBase>(Statepoint);
-    const Function *StatepointFn =
-        StatepointCall ? StatepointCall->getCalledFunction() : nullptr;
-    Check(StatepointFn && StatepointFn->isDeclaration() &&
-              StatepointFn->getIntrinsicID() ==
-                  Intrinsic::experimental_gc_statepoint,
+    Check(StatepointCall && StatepointCall->getIntrinsicID() ==
+                                Intrinsic::experimental_gc_statepoint,
           "gc.result operand #1 must be from a statepoint", Call,
           Call.getArgOperand(0));