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Fix a disconcerting bug in Value::isUsedInBasicBlock, which gave wrong answers for blocks larger than 3 instrs.

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Also add a unit test. PR15727.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179370 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2013-04-12 08:33:11 +00:00
parent 5eacadd649
commit 71c1b22855
3 changed files with 48 additions and 1 deletions
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2
lib/IR/Value.cpp
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@ -118,7 +118,7 @@ bool Value::isUsedInBasicBlock(const BasicBlock *BB) const {
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
if (std::find(I->op_begin(), I->op_end(), this) != I->op_end())
return true;
if (MaxBlockSize-- == 0) // If the block is larger fall back to use_iterator
if (--MaxBlockSize == 0) // If the block is larger fall back to use_iterator
break;
}

1
unittests/IR/CMakeLists.txt
View File

@ -16,6 +16,7 @@ set(IRSources
TypeBuilderTest.cpp
TypesTest.cpp
ValueMapTest.cpp
ValueTest.cpp
VerifierTest.cpp
WaymarkTest.cpp
)

46
unittests/IR/ValueTest.cpp Normal file
View File

@ -0,0 +1,46 @@
//===- llvm/unittest/IR/ValueTest.cpp - Value unit tests ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Assembly/Parser.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
TEST(ValueTest, UsedInBasicBlock) {
LLVMContext C;
const char *ModuleString = "define void @f(i32 %x, i32 %y) {\n"
"bb0:\n"
" %y1 = add i32 %y, 1\n"
" %y2 = add i32 %y, 1\n"
" %y3 = add i32 %y, 1\n"
" %y4 = add i32 %y, 1\n"
" %y5 = add i32 %y, 1\n"
" %y6 = add i32 %y, 1\n"
" %y7 = add i32 %y, 1\n"
" %y8 = add i32 %x, 1\n"
" ret void\n"
"}\n";
SMDiagnostic Err;
Module *M = ParseAssemblyString(ModuleString, NULL, Err, C);
Function *F = M->getFunction("f");
EXPECT_FALSE(F->isUsedInBasicBlock(F->begin()));
EXPECT_TRUE((++F->arg_begin())->isUsedInBasicBlock(F->begin()));
EXPECT_TRUE(F->arg_begin()->isUsedInBasicBlock(F->begin()));
}
} // end anonymous namespace