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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals2; Test that the strncpy library call simplifier works correctly.3;4; RUN: opt < %s -passes=instcombine -S | FileCheck %s5 6target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"7 8@hello = constant [6 x i8] c"hello\00"9@null = constant [1 x i8] zeroinitializer10@null_hello = constant [7 x i8] c"\00hello\00"11@a = common global [32 x i8] zeroinitializer, align 112@b = common global [32 x i8] zeroinitializer, align 113 14declare ptr @strncpy(ptr, ptr, i32)15declare i32 @puts(ptr)16 17; Check a bunch of strncpy invocations together.18 19;.20; CHECK: @hello = constant [6 x i8] c"hello\00"21; CHECK: @null = constant [1 x i8] zeroinitializer22; CHECK: @null_hello = constant [7 x i8] c"\00hello\00"23; CHECK: @a = common global [32 x i8] zeroinitializer, align 124; CHECK: @b = common global [32 x i8] zeroinitializer, align 125; CHECK: @str = private unnamed_addr constant [32 x i8] c"hello\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", align 126; CHECK: @str.1 = private unnamed_addr constant [32 x i8] c"hello\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", align 127; CHECK: @str.2 = private unnamed_addr constant [8 x i8] c"hello\00\00\00", align 128;.29define i32 @test_simplify1() {30; CHECK-LABEL: @test_simplify1(31; CHECK-NEXT: [[TARGET:%.*]] = alloca [1024 x i8], align 132; CHECK-NEXT: store i8 0, ptr [[TARGET]], align 133; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(6) [[TARGET]], ptr noundef nonnull align 1 dereferenceable(6) @hello, i32 6, i1 false)34; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(42) [[TARGET]], i8 0, i32 42, i1 false)35; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(42) [[TARGET]], i8 0, i32 42, i1 false)36; CHECK-NEXT: [[TMP1:%.*]] = call i32 @puts(ptr noundef nonnull dereferenceable(1) [[TARGET]])37; CHECK-NEXT: ret i32 038;39 %target = alloca [1024 x i8]40 store i8 0, ptr %target41 42 %rslt1 = call ptr @strncpy(ptr %target, ptr @hello, i32 6)43 44 %rslt2 = call ptr @strncpy(ptr %rslt1, ptr @null, i32 42)45 46 %rslt3 = call ptr @strncpy(ptr %rslt2, ptr @null_hello, i32 42)47 48 call i32 @puts( ptr %rslt3 )49 ret i32 050}51 52; Check strncpy(x, "", y) -> memset(x, '\0', y, 1).53 54define void @test_simplify2() {55; CHECK-LABEL: @test_simplify2(56; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(32) @a, i8 0, i32 32, i1 false)57; CHECK-NEXT: ret void58;59 60 call ptr @strncpy(ptr @a, ptr @null, i32 32)61 ret void62}63 64; Check strncpy(x, y, 0) -> x.65 66define ptr @test_simplify3() {67; CHECK-LABEL: @test_simplify3(68; CHECK-NEXT: ret ptr @a69;70 71 %ret = call ptr @strncpy(ptr @a, ptr @hello, i32 0)72 ret ptr %ret73}74 75; Check strncpy(x, s, c) -> memcpy(x, s, c, 1) [s and c are constant].76 77define void @test_simplify4() {78; CHECK-LABEL: @test_simplify4(79; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(6) @a, ptr noundef nonnull align 1 dereferenceable(6) @hello, i32 6, i1 false)80; CHECK-NEXT: ret void81;82 83 call ptr @strncpy(ptr @a, ptr @hello, i32 6)84 ret void85}86 87define void @test_simplify5(ptr %dst) {88; CHECK-LABEL: @test_simplify5(89; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(32) [[DST:%.*]], ptr noundef nonnull align 1 dereferenceable(32) @str, i32 32, i1 false)90; CHECK-NEXT: ret void91;92 call ptr @strncpy(ptr dereferenceable(8) %dst, ptr @hello, i32 32)93 ret void94}95 96define void @test_simplify6(ptr %dst) {97; CHECK-LABEL: @test_simplify6(98; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(80) [[DST:%.*]], ptr noundef nonnull align 1 dereferenceable(32) @str.1, i32 32, i1 false)99; CHECK-NEXT: ret void100;101 call ptr @strncpy(ptr dereferenceable(80) %dst, ptr @hello, i32 32)102 ret void103}104 105define void @test_simplify7(ptr %dst, i32 %n) {106; CHECK-LABEL: @test_simplify7(107; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr align 1 dereferenceable(80) [[DST:%.*]], i8 0, i32 [[N:%.*]], i1 false)108; CHECK-NEXT: ret void109;110; Unless N is known to be nonzero, strncpy(D, "", N) need not access any111; bytes in D.112; TODO: The argument, already annotated dereferenceable, should be113; annotated noundef and nonnull by the transformation. See114; https://reviews.llvm.org/D124633.115 call ptr @strncpy(ptr dereferenceable(80) %dst, ptr @null, i32 %n)116 ret void117}118 119define ptr @test1(ptr %dst, ptr %src, i32 %n) {120; CHECK-LABEL: @test1(121; CHECK-NEXT: [[RET:%.*]] = call ptr @strncpy(ptr nonnull [[DST:%.*]], ptr nonnull [[SRC:%.*]], i32 [[N:%.*]])122; CHECK-NEXT: ret ptr [[RET]]123;124; Unless N is known to be nonzero, strncpy(D, S, N) need not access any125; bytes in either D or S. Verify that the call isn't annotated with126; the dereferenceable attribute.127; TODO: Both arguments should be annotated noundef in addition to nonnull.128; See https://reviews.llvm.org/D124633.129 %ret = call ptr @strncpy(ptr nonnull %dst, ptr nonnull %src, i32 %n)130 ret ptr %ret131}132 133define ptr @test2(ptr %dst) {134; CHECK-LABEL: @test2(135; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(5) [[DST:%.*]], ptr noundef nonnull align 1 dereferenceable(6) @hello, i32 5, i1 false)136; CHECK-NEXT: ret ptr [[DST]]137;138 %ret = call ptr @strncpy(ptr nonnull %dst, ptr nonnull @hello, i32 5)139 ret ptr %ret140}141 142define ptr @test3(ptr %dst, i32 %n) {143; CHECK-LABEL: @test3(144; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr noalias noundef nonnull align 1 dereferenceable(5) [[DST:%.*]], i8 0, i32 5, i1 false)145; CHECK-NEXT: ret ptr [[DST]]146;147 %ret = call ptr @strncpy(ptr noalias nonnull %dst, ptr nonnull @null, i32 5);148 ret ptr %ret149}150 151define ptr @test4(ptr %dst, i32 %n) {152; CHECK-LABEL: @test4(153; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr noalias noundef nonnull align 16 dereferenceable(5) [[DST:%.*]], i8 0, i32 5, i1 false)154; CHECK-NEXT: ret ptr [[DST]]155;156 %ret = call ptr @strncpy(ptr align(16) noalias nonnull %dst, ptr nonnull @null, i32 5);157 ret ptr %ret158}159 160; Check cases that shouldn't be simplified.161 162define void @test_no_simplify1() {163; CHECK-LABEL: @test_no_simplify1(164; CHECK-NEXT: [[TMP1:%.*]] = call ptr @strncpy(ptr noundef nonnull dereferenceable(1) @a, ptr noundef nonnull dereferenceable(1) @b, i32 32)165; CHECK-NEXT: ret void166;167 168 call ptr @strncpy(ptr @a, ptr @b, i32 32)169 ret void170}171 172define void @test_no_simplify2() {173; CHECK-LABEL: @test_no_simplify2(174; CHECK-NEXT: store i64 478560413032, ptr @a, align 1175; CHECK-NEXT: ret void176;177 178 call ptr @strncpy(ptr @a, ptr @hello, i32 8)179 ret void180}181 182define ptr @test_no_simplify3(ptr %dst, ptr %src, i32 %count) {183; CHECK-LABEL: @test_no_simplify3(184; CHECK-NEXT: [[RET:%.*]] = musttail call ptr @strncpy(ptr [[DST:%.*]], ptr [[SRC:%.*]], i32 32)185; CHECK-NEXT: ret ptr [[RET]]186;187 %ret = musttail call ptr @strncpy(ptr %dst, ptr %src, i32 32)188 ret ptr %ret189}190 191define ptr @test_no_simplify4(ptr %dst, ptr %src, i32 %count) {192; CHECK-LABEL: @test_no_simplify4(193; CHECK-NEXT: [[RET:%.*]] = musttail call ptr @strncpy(ptr [[DST:%.*]], ptr [[SRC:%.*]], i32 6)194; CHECK-NEXT: ret ptr [[RET]]195;196 %ret = musttail call ptr @strncpy(ptr %dst, ptr %src, i32 6)197 ret ptr %ret198}199 200 201define void @test_no_incompatible_attr() {202; CHECK-LABEL: @test_no_incompatible_attr(203; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(6) @a, ptr noundef nonnull align 1 dereferenceable(6) @hello, i32 6, i1 false)204; CHECK-NEXT: ret void205;206 207 call ptr @strncpy(ptr @a, ptr @hello, i32 6)208 ret void209}210;.211; CHECK: attributes #[[ATTR0:[0-9]+]] = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }212; CHECK: attributes #[[ATTR1:[0-9]+]] = { nocallback nofree nounwind willreturn memory(argmem: write) }213;.214