Added test to cover the CFLAA bitset indexing bug.

llvm-svn: 226710

1 files changed, 33 insertions, 0 deletions

diff --git a/llvm/test/Analysis/CFLAliasAnalysis/stratified-attrs-indexing.ll b/llvm/test/Analysis/CFLAliasAnalysis/stratified-attrs-indexing.ll
new file mode 100644
index 00000000000..8afedf2e139
--- /dev/null
+++ b/llvm/test/Analysis/CFLAliasAnalysis/stratified-attrs-indexing.ll
@@ -0,0 +1,33 @@
+; This testcase ensures that CFLAA doesn't try to access out of bounds indices
+; when given functions with large amounts of arguments (specifically, more
+; arguments than the StratifiedAttrs bitset can handle)
+;
+; Because the result on failure is effectively crashing the compiler, output
+; checking is minimal.
+
+; RUN: opt < %s -cfl-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s
+
+; CHECK: Function: test
+define void @test(i1 %cond,
+                  i32* %arg1, i32* %arg2, i32* %arg3, i32* %arg4, i32* %arg5,
+                  i32* %arg6, i32* %arg7, i32* %arg8, i32* %arg9, i32* %arg10,
+                  i32* %arg11, i32* %arg12, i32* %arg13, i32* %arg14, i32* %arg15,
+                  i32* %arg16, i32* %arg17, i32* %arg18, i32* %arg19, i32* %arg20,
+                  i32* %arg21, i32* %arg22, i32* %arg23, i32* %arg24, i32* %arg25,
+                  i32* %arg26, i32* %arg27, i32* %arg28, i32* %arg29, i32* %arg30,
+                  i32* %arg31, i32* %arg32, i32* %arg33, i32* %arg34, i32* %arg35) {
+
+  ; CHECK: 946 Total Alias Queries Performed
+  ; CHECK: 810 no alias responses (85.6%)
+  %a = alloca i32, align 4
+  %b = select i1 %cond, i32* %arg35, i32* %arg34
+  %c = select i1 %cond, i32* %arg34, i32* %arg33
+  %d = select i1 %cond, i32* %arg33, i32* %arg32
+  %e = select i1 %cond, i32* %arg32, i32* %arg31
+  %f = select i1 %cond, i32* %arg31, i32* %arg30
+  %g = select i1 %cond, i32* %arg30, i32* %arg29
+  %h = select i1 %cond, i32* %arg29, i32* %arg28
+  %i = select i1 %cond, i32* %arg28, i32* %arg27
+
+  ret void
+}