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[BasicAA] Add test for decomposition limit (NFC)

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Test behavior before/at/after the GEP decomposition limit.
This commit is contained in:
Nikita Popov 2020-11-09 20:42:57 +01:00
parent 7328f3b211
commit d459bc8cde
1 changed files with 31 additions and 0 deletions
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31
test/Analysis/BasicAA/gep-decomposition-limit.ll Normal file
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; 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
}