vendor/llvm/llvm-trunk-r366426

1 files changed, 32 insertions, 4 deletions

diff --git a/lib/Analysis/GuardUtils.cpp b/lib/Analysis/GuardUtils.cpp
index 08fa6abeafb5..cad92f6e56bb 100644
--- a/lib/Analysis/GuardUtils.cpp
+++ b/lib/Analysis/GuardUtils.cpp
@@ -1,9 +1,8 @@
 //===-- GuardUtils.cpp - Utils for work with guards -------------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // Utils that are used to perform analyzes related to guards and their
@@ -19,3 +18,32 @@ bool llvm::isGuard(const User *U) {
   using namespace llvm::PatternMatch;
   return match(U, m_Intrinsic<Intrinsic::experimental_guard>());
 }
+
+bool llvm::isGuardAsWidenableBranch(const User *U) {
+  Value *Condition, *WidenableCondition;
+  BasicBlock *GuardedBB, *DeoptBB;
+  if (!parseWidenableBranch(U, Condition, WidenableCondition, GuardedBB,
+                            DeoptBB))
+    return false;
+  using namespace llvm::PatternMatch;
+  for (auto &Insn : *DeoptBB) {
+    if (match(&Insn, m_Intrinsic<Intrinsic::experimental_deoptimize>()))
+      return true;
+    if (Insn.mayHaveSideEffects())
+      return false;
+  }
+  return false;
+}
+
+bool llvm::parseWidenableBranch(const User *U, Value *&Condition,
+                                Value *&WidenableCondition,
+                                BasicBlock *&IfTrueBB, BasicBlock *&IfFalseBB) {
+  using namespace llvm::PatternMatch;
+  if (!match(U, m_Br(m_And(m_Value(Condition), m_Value(WidenableCondition)),
+                     IfTrueBB, IfFalseBB)))
+    return false;
+  // TODO: At the moment, we only recognize the branch if the WC call in this
+  // specific position.  We should generalize!
+  return match(WidenableCondition,
+               m_Intrinsic<Intrinsic::experimental_widenable_condition>());
+}