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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 52; RUN: opt -S -passes=instcombine < %s | FileCheck %s3 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]], 08; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]])9; CHECK-NEXT: ret void10;11 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 %len, i1 false)12 ret void13}14 15define void @memset_null_ub() {16; CHECK-LABEL: define void @memset_null_ub() {17; CHECK-NEXT: store i64 poison, ptr null, align 429496729618; CHECK-NEXT: ret void19;20 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 8, i1 false)21 ret void22}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]], 028; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]])29; CHECK-NEXT: ret void30;31 call void @llvm.memcpy.p0.i64(ptr %dst, ptr null, i64 %len, i1 false)32 ret void33}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]], 039; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]])40; CHECK-NEXT: ret void41;42 call void @llvm.memmove.p0.i64(ptr %dst, ptr null, i64 %len, i1 false)43 ret void44}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]], 050; CHECK-NEXT: call void @llvm.assume(i1 [[TMP1]])51; CHECK-NEXT: ret void52;53 call void @llvm.memset.element.unordered.atomic.p0.i64(ptr align 1 null, i8 0, i64 %len, i32 1)54 ret void55}56 57; negative tests58 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 void64;65 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 %len, i1 true)66 ret void67}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 void74;75 call void @llvm.memset.p0.i64(ptr null, i8 0, i64 %len, i1 false)76 ret void77}78