From dd5b51f4fabbb44c2f6629f0dafefa7b7f3f0b23 Mon Sep 17 00:00:00 2001 From: Nikita Popov Date: Mon, 9 Nov 2020 20:42:57 +0100 Subject: [PATCH] [BasicAA] Add test for decomposition limit (NFC) Test behavior before/at/after the GEP decomposition limit. --- .../Analysis/BasicAA/gep-decomposition-limit.ll | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 llvm/test/Analysis/BasicAA/gep-decomposition-limit.ll diff --git a/llvm/test/Analysis/BasicAA/gep-decomposition-limit.ll b/llvm/test/Analysis/BasicAA/gep-decomposition-limit.ll new file mode 100644 index 0000000..a375c4e --- /dev/null +++ b/llvm/test/Analysis/BasicAA/gep-decomposition-limit.ll @@ -0,0 +1,31 @@ +; RUN: opt -S -basic-aa -aa-eval -print-all-alias-modref-info -disable-output < %s 2>&1 | FileCheck %s + +; CHECK-LABEL: Function: test +;; Before limit: +; CHECK-DAG: MustAlias: i8* %gep.add5, i8* %gep.inc5 +; CHECK-DAG: NoAlias: i8* %gep.inc3, i8* %gep.inc5 +; CHECK-DAG: NoAlias: i8* %gep.inc4, i8* %gep.inc5 +;; At limit: +; CHECK-DAG: MayAlias: i8* %gep.add6, i8* %gep.inc6 +; CHECK-DAG: MayAlias: i8* %gep.inc4, i8* %gep.inc6 +; CHECK-DAG: MayAlias: i8* %gep.inc5, i8* %gep.inc6 +;; After limit: +; CHECK-DAG: MayAlias: i8* %gep.add7, i8* %gep.inc7 +; CHECK-DAG: MayAlias: i8* %gep.inc5, i8* %gep.inc7 +; CHECK-DAG: MayAlias: i8* %gep.inc6, i8* %gep.inc7 + +define void @test(i8* %base) { + %gep.add5 = getelementptr i8, i8* %base, i64 5 + %gep.add6 = getelementptr i8, i8* %base, i64 6 + %gep.add7 = getelementptr i8, i8* %base, i64 7 + + %gep.inc1 = getelementptr i8, i8* %base, i64 1 + %gep.inc2 = getelementptr i8, i8* %gep.inc1, i64 1 + %gep.inc3 = getelementptr i8, i8* %gep.inc2, i64 1 + %gep.inc4 = getelementptr i8, i8* %gep.inc3, i64 1 + %gep.inc5 = getelementptr i8, i8* %gep.inc4, i64 1 + %gep.inc6 = getelementptr i8, i8* %gep.inc5, i64 1 + %gep.inc7 = getelementptr i8, i8* %gep.inc6, i64 1 + + ret void +} -- 2.7.4