1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5 2; RUN: opt -S -passes=instcombine < %s | FileCheck %s 3 4define void @memset_null(i64 %len) { 5; CHECK-LABEL: define void @memset_null( 6; CHECK-SAME: i64 [[LEN:%.*]]) { 7; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[LEN]], 0 8; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]]) 9; CHECK-NEXT: ret void 10; 11 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 %len, i1 false) 12 ret void 13} 14 15define void @memset_null_ub() { 16; CHECK-LABEL: define void @memset_null_ub() { 17; CHECK-NEXT: store i64 poison, ptr null, align 4294967296 18; CHECK-NEXT: ret void 19; 20 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 8, i1 false) 21 ret void 22} 23 24define void @memcpy_null_src(ptr %dst, i64 %len) { 25; CHECK-LABEL: define void @memcpy_null_src( 26; CHECK-SAME: ptr [[DST:%.*]], i64 [[LEN:%.*]]) { 27; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[LEN]], 0 28; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]]) 29; CHECK-NEXT: ret void 30; 31 call void @llvm.memcpy.p0.i64(ptr %dst, ptr null, i64 %len, i1 false) 32 ret void 33} 34 35define void @memmove_null_src(ptr %dst, i64 %len) { 36; CHECK-LABEL: define void @memmove_null_src( 37; CHECK-SAME: ptr [[DST:%.*]], i64 [[LEN:%.*]]) { 38; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[LEN]], 0 39; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]]) 40; CHECK-NEXT: ret void 41; 42 call void @llvm.memmove.p0.i64(ptr %dst, ptr null, i64 %len, i1 false) 43 ret void 44} 45 46define void @memset_element_atomic(i64 %len) { 47; CHECK-LABEL: define void @memset_element_atomic( 48; CHECK-SAME: i64 [[LEN:%.*]]) { 49; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[LEN]], 0 50; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]]) 51; CHECK-NEXT: ret void 52; 53 call void @llvm.memset.element.unordered.atomic.p0.i64(ptr align 1 null, i8 0, i64 %len, i32 1) 54 ret void 55} 56 57; negative tests 58 59define void @memset_null_volatile(i64 %len) { 60; CHECK-LABEL: define void @memset_null_volatile( 61; CHECK-SAME: i64 [[LEN:%.*]]) { 62; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr null, i8 0, i64 [[LEN]], i1 true) 63; CHECK-NEXT: ret void 64; 65 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 %len, i1 true) 66 ret void 67} 68 69define void @memset_null_is_defined(i64 %len) null_pointer_is_valid { 70; CHECK-LABEL: define void @memset_null_is_defined( 71; CHECK-SAME: i64 [[LEN:%.*]]) #[[ATTR0:[0-9]+]] { 72; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4294967296 null, i8 0, i64 [[LEN]], i1 false) 73; CHECK-NEXT: ret void 74; 75 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 %len, i1 false) 76 ret void 77} 78