| ; This testcase consists of alias relations which should be completely |
| ; resolvable by cfl-steens-aa, but require analysis of getelementptr constant exprs. |
| ; Derived from BasicAA/2003-12-11-ConstExprGEP.ll |
| |
| ; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s |
| |
| %T = type { i32, [10 x i8] } |
| |
| @G = external global %T |
| @G2 = external global %T |
| |
| ; TODO: Quite a few of these are MayAlias because we don't yet consider |
| ; constant offsets in CFLSteensAA. If we start doing so, then we'll need to |
| ; change these test cases |
| |
| ; CHECK: Function: test |
| ; CHECK: MayAlias: i32* %D, i32* %F |
| ; CHECK: MayAlias: i32* %D, i8* %X |
| ; CHECK: MayAlias: i32* %F, i8* %X |
| define void @test() { |
| %D = getelementptr %T, %T* @G, i64 0, i32 0 |
| %F = getelementptr i32, i32* getelementptr (%T, %T* @G, i64 0, i32 0), i64 0 |
| %X = getelementptr [10 x i8], [10 x i8]* getelementptr (%T, %T* @G, i64 0, i32 1), i64 0, i64 5 |
| |
| ret void |
| } |
| |
| ; CHECK: Function: simplecheck |
| ; CHECK: MayAlias: i32* %F, i32* %arg0 |
| ; CHECK: MayAlias: i32* %H, i32* %arg0 |
| ; CHECK: MayAlias: i32* %F, i32* %H |
| define void @simplecheck(i32* %arg0) { |
| %F = getelementptr i32, i32* getelementptr (%T, %T* @G, i64 0, i32 0), i64 0 |
| %H = getelementptr %T, %T* @G2, i64 0, i32 0 |
| |
| ret void |
| } |
| |
| ; Ensure that CFLSteensAA properly identifies and handles escaping variables (i.e. |
| ; globals) in nested ConstantExprs |
| |
| ; CHECK: Function: checkNesting |
| ; CHECK: MayAlias: i32* %A, i32* %arg0 |
| |
| %NestedT = type { [1 x [1 x i32]] } |
| @NT = external global %NestedT |
| |
| define void @checkNesting(i32* %arg0) { |
| %A = getelementptr [1 x i32], |
| [1 x i32]* getelementptr |
| ([1 x [1 x i32]], [1 x [1 x i32]]* getelementptr (%NestedT, %NestedT* @NT, i64 0, i32 0), |
| i64 0, |
| i32 0), |
| i64 0, |
| i32 0 |
| ret void |
| } |