[PATCH] D42406: Utils: Fix DomTree update for entry block
Matt Arsenault via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Jan 22 19:10:20 PST 2018
arsenm created this revision.
arsenm added a reviewer: kuhar.
Herald added subscribers: hintonda, mgorny, wdng.
If SplitBlockPredecessors was used on a function entry block,
it wouldn't update the dominator tree.
https://reviews.llvm.org/D42406
Files:
lib/Transforms/Utils/BasicBlockUtils.cpp
unittests/Transforms/Utils/BasicBlockUtils.cpp
unittests/Transforms/Utils/CMakeLists.txt
unittests/Transforms/Utils/Local.cpp
Index: unittests/Transforms/Utils/Local.cpp
===================================================================
--- unittests/Transforms/Utils/Local.cpp
+++ unittests/Transforms/Utils/Local.cpp
@@ -100,7 +100,7 @@
EXPECT_EQ(3U, BB->size());
}
-std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
+static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
SMDiagnostic Err;
std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
if (!Mod)
Index: unittests/Transforms/Utils/CMakeLists.txt
===================================================================
--- unittests/Transforms/Utils/CMakeLists.txt
+++ unittests/Transforms/Utils/CMakeLists.txt
@@ -8,6 +8,7 @@
add_llvm_unittest(UtilsTests
ASanStackFrameLayoutTest.cpp
+ BasicBlockUtils.cpp
Cloning.cpp
CodeExtractor.cpp
FunctionComparator.cpp
Index: unittests/Transforms/Utils/BasicBlockUtils.cpp
===================================================================
--- /dev/null
+++ unittests/Transforms/Utils/BasicBlockUtils.cpp
@@ -0,0 +1,51 @@
+//===- BasicBlockUtils.cpp - Unit tests for BasicBlockUtils ---------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Utils/BasicBlockUtils.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Support/SourceMgr.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
+ SMDiagnostic Err;
+ std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
+ if (!Mod)
+ Err.print("BasicBlockUtilsTests", errs());
+ return Mod;
+}
+
+TEST(BasicBlockUtils, SplitBlockPredecessors) {
+ LLVMContext C;
+
+ std::unique_ptr<Module> M = parseIR(
+ C,
+ "define void @basic_func(i1 %cond) {\n"
+ "entry:\n"
+ " br i1 %cond, label %bb0, label %bb1\n"
+ "bb0:\n"
+ " ret void\n"
+ "bb1:\n"
+ " ret void\n"
+ "}\n"
+ "\n"
+ );
+
+ auto *F = M->getFunction("basic_func");
+ DominatorTree DT(*F);
+
+ // Make sure the dominator tree is properly updated if calling this on the
+ // entry block.
+ SplitBlockPredecessors(&F->getEntryBlock(), {}, "split.entry", &DT);
+ EXPECT_TRUE(DT.verify());
+}
Index: lib/Transforms/Utils/BasicBlockUtils.cpp
===================================================================
--- lib/Transforms/Utils/BasicBlockUtils.cpp
+++ lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -504,6 +504,9 @@
// Insert dummy values as the incoming value.
for (BasicBlock::iterator I = BB->begin(); isa<PHINode>(I); ++I)
cast<PHINode>(I)->addIncoming(UndefValue::get(I->getType()), NewBB);
+
+ if (DT && BB == DT->getRootNode()->getBlock())
+ DT->setNewRoot(NewBB);
return NewBB;
}
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