36 lines
1.2 KiB
LLVM
36 lines
1.2 KiB
LLVM
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; This testcase ensures that CFL AA answers queries soundly when callee tries
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; to return the reference of one of its parameters
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; RUN: opt < %s -disable-basic-aa -cfl-steens-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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; RUN: opt < %s -aa-pipeline=cfl-steens-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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declare noalias i8* @malloc(i64)
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define i32** @return_ref_arg_callee(i32* %arg1) {
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%ptr = call noalias i8* @malloc(i64 8)
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%ptr_cast = bitcast i8* %ptr to i32**
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store i32* %arg1, i32** %ptr_cast
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ret i32** %ptr_cast
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}
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; CHECK-LABEL: Function: test_return_ref_arg
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; CHECK: MayAlias: i32* %a, i32* %lb
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; CHECK: NoAlias: i32* %lb, i32** %p
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; CHECK: NoAlias: i32* %lb, i32** %b
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; CHECK: NoAlias: i32* %lp, i32** %p
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; CHECK: NoAlias: i32* %lp, i32** %b
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; CHECK: MayAlias: i32* %lb, i32* %lp
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; We could've proven the following facts if the analysis were inclusion-based:
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; NoAlias: i32** %b, i32** %p
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define void @test_return_ref_arg() {
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%a = alloca i32, align 4
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%p = alloca i32*, align 8
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store i32* %a, i32** %p
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%b = call i32** @return_ref_arg_callee(i32* %a)
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%lb = load i32*, i32** %b
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%lp = load i32*, i32** %p
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ret void
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}
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