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.p0i8.i64(i8* nocapture, i8, i64, i1) 7%struct.tree_common = type { i8*, i8*, i32 } 8 9; Original test case which exhibited the bug 10define void @test1(%struct.tree_common* %t, i32 %code, i8* %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 %0 = bitcast %struct.tree_common* %t to i8* 17 tail call void @llvm.memset.p0i8.i64(i8* align 8 %0, i8 0, i64 24, i1 false) 18 %code1 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 2 19 store i32 %code, i32* %code1, align 8 20 %type2 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 1 21 store i8* %type, i8** %type2, align 8 22 ret void 23} 24 25; Store to each struct element instead of using memset 26define void @test2(%struct.tree_common* %t, i32 %code, i8* %type) { 27; CHECK-LABEL: test2: 28; CHECK-DAG: str w1, [x0, #16] 29; CHECK-DAG: stp xzr, x2, [x0] 30entry: 31 %0 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 0 32 %1 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 1 33 %2 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 2 34 store i8* zeroinitializer, i8** %0, align 8 35 store i8* zeroinitializer, i8** %1, align 8 36 store i32 zeroinitializer, i32* %2, align 8 37 store i32 %code, i32* %2, align 8 38 store i8* %type, i8** %1, align 8 39 ret void 40} 41 42; Vector store instead of memset 43define void @test3(%struct.tree_common* %t, i32 %code, i8* %type) { 44; CHECK-LABEL: test3: 45; CHECK-DAG: stp x2, xzr, [x0, #8] 46; CHECK-DAG: str w1, [x0, #16] 47; CHECK-DAG: str xzr, [x0] 48entry: 49 %0 = bitcast %struct.tree_common* %t to <3 x i64>* 50 store <3 x i64> zeroinitializer, <3 x i64>* %0, align 8 51 %code1 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 2 52 store i32 %code, i32* %code1, align 8 53 %type2 = getelementptr inbounds %struct.tree_common, %struct.tree_common* %t, i64 0, i32 1 54 store i8* %type, i8** %type2, align 8 55 ret void 56} 57 58; Vector store, then store to vector elements 59define void @test4(<3 x i64>* %p, i64 %x, i64 %y) { 60; CHECK-LABEL: test4: 61; CHECK-DAG: stp x2, x1, [x0, #8] 62; CHECK-DAG: str xzr, [x0] 63entry: 64 store <3 x i64> zeroinitializer, <3 x i64>* %p, align 8 65 %0 = bitcast <3 x i64>* %p to i64* 66 %1 = getelementptr inbounds i64, i64* %0, i64 2 67 store i64 %x, i64* %1, align 8 68 %2 = getelementptr inbounds i64, i64* %0, i64 1 69 store i64 %y, i64* %2, align 8 70 ret void 71} 72