; RUN: llc -mtriple=aarch64 -mcpu=cortex-a53 < %s | FileCheck %s ; Tests to check that zero stores which are generated as STP xzr, xzr aren't ; scheduled incorrectly due to incorrect alias information declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) %struct.tree_common = type { ptr, ptr, i32 } ; Original test case which exhibited the bug define void @test1(ptr %t, i32 %code, ptr %type) { ; CHECK-LABEL: test1: ; CHECK-DAG: stp x2, xzr, [x0, #8] ; CHECK-DAG: str w1, [x0, #16] ; CHECK-DAG: str xzr, [x0] entry: tail call void @llvm.memset.p0.i64(ptr align 8 %t, i8 0, i64 24, i1 false) %code1 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 2 store i32 %code, ptr %code1, align 8 %type2 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 1 store ptr %type, ptr %type2, align 8 ret void } ; Store to each struct element instead of using memset define void @test2(ptr %t, i32 %code, ptr %type) { ; CHECK-LABEL: test2: ; CHECK-DAG: str w1, [x0, #16] ; CHECK-DAG: stp xzr, x2, [x0] entry: %0 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 1 %1 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 2 store ptr zeroinitializer, ptr %t, align 8 store ptr zeroinitializer, ptr %0, align 8 store i32 zeroinitializer, ptr %1, align 8 store i32 %code, ptr %1, align 8 store ptr %type, ptr %0, align 8 ret void } ; Vector store instead of memset define void @test3(ptr %t, i32 %code, ptr %type) { ; CHECK-LABEL: test3: ; CHECK-DAG: stp x2, xzr, [x0, #8] ; CHECK-DAG: str w1, [x0, #16] ; CHECK-DAG: str xzr, [x0] entry: store <3 x i64> zeroinitializer, ptr %t, align 8 %code1 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 2 store i32 %code, ptr %code1, align 8 %type2 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 1 store ptr %type, ptr %type2, align 8 ret void } ; Vector store, then store to vector elements define void @test4(ptr %p, i64 %x, i64 %y) { ; CHECK-LABEL: test4: ; CHECK-DAG: stp x2, x1, [x0, #8] ; CHECK-DAG: str xzr, [x0] entry: store <3 x i64> zeroinitializer, ptr %p, align 8 %0 = getelementptr inbounds i64, ptr %p, i64 2 store i64 %x, ptr %0, align 8 %1 = getelementptr inbounds i64, ptr %p, i64 1 store i64 %y, ptr %1, align 8 ret void }