[PM] Add more dedicated testing to cover the invalidation logic added to

BasicAA in r290603.

I've kept the basic testing in the new PM test file as that also covers
the AAManager invalidation logic. If/when there is a good place for
broader AA testing it could move there.

This test is somewhat unsatisfying as I can't get it to fail even with
ASan outside of explicit checks of the invalidation. Apparently we don't
yet have any test coverage of the BasicAA code paths using either the
domtree or loopinfo -- I made both of them always be null and check-llvm
passed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290612 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/BasicAA/invalidation.ll b/test/Analysis/BasicAA/invalidation.ll
new file mode 100644 (file)
index 0000000..0eaf775
--- /dev/null
+++ b/test/Analysis/BasicAA/invalidation.ll
@@ -0,0 +1,47 @@
+; Test that the BasicAA analysis gets invalidated when its dependencies go
+; away.
+;
+; Check DomTree specifically.
+; RUN: opt -disable-output -disable-verify -debug-pass-manager %s 2>&1 \
+; RUN:     -passes='require<aa>,invalidate<domtree>,aa-eval' -aa-pipeline='basic-aa' \
+; RUN:     | FileCheck %s --check-prefix=CHECK-DT-INVALIDATE
+; CHECK-DT-INVALIDATE: Running pass: RequireAnalysisPass
+; CHECK-DT-INVALIDATE: Running analysis: BasicAA
+; CHECK-DT-INVALIDATE: Running pass: InvalidateAnalysisPass
+; CHECK-DT-INVALIDATE: Invalidating analysis: DominatorTreeAnalysis
+; CHECK-DT-INVALIDATE: Invalidating analysis: BasicAA
+; CHECK-DT-INVALIDATE: Running pass: AAEvaluator
+; CHECK-DT-INVALIDATE: Running analysis: BasicAA
+;
+; Check LoopInfo specifically.
+; RUN: opt -disable-output -disable-verify -debug-pass-manager %s 2>&1 \
+; RUN:     -passes='require<loops>,require<aa>,invalidate<loops>,aa-eval' -aa-pipeline='basic-aa' \
+; RUN:     | FileCheck %s --check-prefix=CHECK-LI-INVALIDATE
+; CHECK-LI-INVALIDATE: Running pass: RequireAnalysisPass
+; CHECK-LI-INVALIDATE: Running analysis: BasicAA
+; CHECK-LI-INVALIDATE: Running pass: InvalidateAnalysisPass
+; CHECK-LI-INVALIDATE: Invalidating analysis: LoopAnalysis
+; CHECK-LI-INVALIDATE: Invalidating analysis: BasicAA
+; CHECK-LI-INVALIDATE: Running pass: AAEvaluator
+; CHECK-LI-INVALIDATE: Running analysis: BasicAA
+
+; Some code that will result in actual AA queries, including inside of a loop.
+; FIXME: Sadly, none of these queries managed to use either the domtree or
+; loopinfo that basic-aa cache. But nor does any other test in LLVM. It would
+; be good to enhance this to actually use these other analyses to make this
+; a more thorough test.
+define void @foo(i1 %x, i8* %p1, i8* %p2) {
+entry:
+  %p3 = alloca i8
+  store i8 42, i8* %p1
+  %gep2 = getelementptr i8, i8* %p2, i32 0
+  br i1 %x, label %loop, label %exit
+
+loop:
+  store i8 13, i8* %p3
+  %tmp1 = load i8, i8* %gep2
+  br label %loop
+
+exit:
+  ret void
+}