[llvm] e9b8d70 - [BasicAA] Add test for phi of geps of alloca (NFC)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Mon Oct 17 07:47:47 PDT 2022
Author: Nikita Popov
Date: 2022-10-17T16:47:35+02:00
New Revision: e9b8d704d385472c68a50aa58413e880dd5d9aae
URL: https://github.com/llvm/llvm-project/commit/e9b8d704d385472c68a50aa58413e880dd5d9aae
DIFF: https://github.com/llvm/llvm-project/commit/e9b8d704d385472c68a50aa58413e880dd5d9aae.diff
LOG: [BasicAA] Add test for phi of geps of alloca (NFC)
Make sure we continue determining NoAlias in this case, where we
have a phi of constant index GEPs based on an alloca.
Added:
Modified:
llvm/test/Analysis/BasicAA/phi-aa.ll
Removed:
################################################################################
diff --git a/llvm/test/Analysis/BasicAA/phi-aa.ll b/llvm/test/Analysis/BasicAA/phi-aa.ll
index 9eb63cf24f60..799bf5b2d3fd 100644
--- a/llvm/test/Analysis/BasicAA/phi-aa.ll
+++ b/llvm/test/Analysis/BasicAA/phi-aa.ll
@@ -223,3 +223,26 @@ split:
load i32, i32* %ptr.next.phi
br label %loop
}
+
+; CHECK-LABEL: phi_of_geps_based_on_alloca
+; CHECK: NoAlias: i32* %gep3, i32* %phi
+define void @phi_of_geps_based_on_alloca(i1 %c) {
+ %a = alloca [3 x i32]
+ %p = bitcast [3 x i32]* %a to i32*
+ br i1 %c, label %if, label %else
+
+if:
+ %gep1 = getelementptr i32, i32* %p, i64 1
+ br label %join
+
+else:
+ %gep2 = getelementptr i32, i32* %p, i64 2
+ br label %join
+
+join:
+ %phi = phi i32* [ %gep1, %if ], [ %gep2, %else ]
+ %gep3 = getelementptr i32, i32* %p, i64 3
+ load i32, i32* %phi
+ load i32, i32* %gep3
+ ret void
+}
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