[llvm] dd5b51f - [BasicAA] Add test for decomposition limit (NFC)

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2020-11-09T21:31:11+01:00
New Revision: dd5b51f4fabbb44c2f6629f0dafefa7b7f3f0b23

URL: https://github.com/llvm/llvm-project/commit/dd5b51f4fabbb44c2f6629f0dafefa7b7f3f0b23
DIFF: https://github.com/llvm/llvm-project/commit/dd5b51f4fabbb44c2f6629f0dafefa7b7f3f0b23.diff

LOG: [BasicAA] Add test for decomposition limit (NFC)

Test behavior before/at/after the GEP decomposition limit.

Added: 
    llvm/test/Analysis/BasicAA/gep-decomposition-limit.ll

Modified: 
    

Removed: 
    


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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 000000000000..a375c4e7b148
--- /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
+}