1; RUN: llc -mtriple=aarch64 -mcpu=cortex-a53 < %s | FileCheck %s 2 3; Tests to check that zero stores which are generated as STP xzr, xzr aren't 4; scheduled incorrectly due to incorrect alias information 5 6declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) 7%struct.tree_common = type { ptr, ptr, i32 } 8 9; Original test case which exhibited the bug 10define void @test1(ptr %t, i32 %code, ptr %type) { 11; CHECK-LABEL: test1: 12; CHECK-DAG: stp x2, xzr, [x0, #8] 13; CHECK-DAG: str w1, [x0, #16] 14; CHECK-DAG: str xzr, [x0] 15entry: 16 tail call void @llvm.memset.p0.i64(ptr align 8 %t, i8 0, i64 24, i1 false) 17 %code1 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 2 18 store i32 %code, ptr %code1, align 8 19 %type2 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 1 20 store ptr %type, ptr %type2, align 8 21 ret void 22} 23 24; Store to each struct element instead of using memset 25define void @test2(ptr %t, i32 %code, ptr %type) { 26; CHECK-LABEL: test2: 27; CHECK-DAG: str w1, [x0, #16] 28; CHECK-DAG: stp xzr, x2, [x0] 29entry: 30 %0 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 1 31 %1 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 2 32 store ptr zeroinitializer, ptr %t, align 8 33 store ptr zeroinitializer, ptr %0, align 8 34 store i32 zeroinitializer, ptr %1, align 8 35 store i32 %code, ptr %1, align 8 36 store ptr %type, ptr %0, align 8 37 ret void 38} 39 40; Vector store instead of memset 41define void @test3(ptr %t, i32 %code, ptr %type) { 42; CHECK-LABEL: test3: 43; CHECK-DAG: stp x2, xzr, [x0, #8] 44; CHECK-DAG: str w1, [x0, #16] 45; CHECK-DAG: str xzr, [x0] 46entry: 47 store <3 x i64> zeroinitializer, ptr %t, align 8 48 %code1 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 2 49 store i32 %code, ptr %code1, align 8 50 %type2 = getelementptr inbounds %struct.tree_common, ptr %t, i64 0, i32 1 51 store ptr %type, ptr %type2, align 8 52 ret void 53} 54 55; Vector store, then store to vector elements 56define void @test4(ptr %p, i64 %x, i64 %y) { 57; CHECK-LABEL: test4: 58; CHECK-DAG: stp x2, x1, [x0, #8] 59; CHECK-DAG: str xzr, [x0] 60entry: 61 store <3 x i64> zeroinitializer, ptr %p, align 8 62 %0 = getelementptr inbounds i64, ptr %p, i64 2 63 store i64 %x, ptr %0, align 8 64 %1 = getelementptr inbounds i64, ptr %p, i64 1 65 store i64 %y, ptr %1, align 8 66 ret void 67} 68