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Fix an oversight in isPotentiallyReachable where we wouldn't do any CFG-walking

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to find loops if the From and To instructions were in the same block.

Refactor the code a little now that we need to fill to start the CFG-walking
algorithm with more than one starting basic block sometimes.

Special thanks to Andrew Trick for catching an error in my understanding of
natural loops in code review.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188236 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2013-08-13 00:03:47 +00:00
parent b58bddf258
commit 72dba254ae
3 changed files with 99 additions and 53 deletions
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17
unittests/Analysis/CFGTest.cpp
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@@ -147,6 +147,23 @@ TEST_F(IsPotentiallyReachableTest, SameBlockPath) {
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, SameBlockNoLoop) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" br label %middle\n"
"middle:\n"
" %B = bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" %A = bitcast i8 undef to i8\n"
" br label %nextblock\n"
"nextblock:\n"
" ret void\n"
"}\n");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, StraightNoPath) {
ParseAssembly(
"define void @test() {\n"