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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; Test that the strncat libcall 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@empty = constant [1 x i8] c"\00"10@a = common global [32 x i8] zeroinitializer, align 111declare ptr @strncat(ptr, ptr, i32)12 13define void @test_simplify1() {14; CHECK-LABEL: @test_simplify1(15; CHECK-NEXT: [[STRLEN:%.*]] = call i32 @strlen(ptr noundef nonnull dereferenceable(1) @a)16; CHECK-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds i8, ptr @a, i32 [[STRLEN]]17; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(6) [[ENDPTR]], ptr noundef nonnull align 1 dereferenceable(6) @hello, i32 6, i1 false)18; CHECK-NEXT: ret void19;20 21 call ptr @strncat(ptr @a, ptr @hello, i32 13)22 ret void23}24 25define void @test_simplify2() {26; CHECK-LABEL: @test_simplify2(27; CHECK-NEXT: ret void28;29 30 call ptr @strncat(ptr @a, ptr @empty, i32 13)31 ret void32}33 34define void @test_simplify3() {35; CHECK-LABEL: @test_simplify3(36; CHECK-NEXT: ret void37;38 39 call ptr @strncat(ptr @a, ptr @hello, i32 0)40 ret void41}42 43define void @test_nosimplify1() {44; CHECK-LABEL: @test_nosimplify1(45; CHECK-NEXT: [[TMP1:%.*]] = call ptr @strncat(ptr noundef nonnull dereferenceable(1) @a, ptr noundef nonnull dereferenceable(6) @hello, i32 1)46; CHECK-NEXT: ret void47;48 49 call ptr @strncat(ptr @a, ptr @hello, i32 1)50 ret void51}52 53; strncat(nonnull x, nonnull y, n) -> strncat(nonnull x, y, n)54define ptr @test1(ptr %str1, ptr %str2, i32 %n) {55; CHECK-LABEL: @test1(56; CHECK-NEXT: [[TEMP1:%.*]] = call ptr @strncat(ptr noundef nonnull dereferenceable(1) [[STR1:%.*]], ptr nonnull [[STR2:%.*]], i32 [[N:%.*]])57; CHECK-NEXT: ret ptr [[TEMP1]]58;59 60 %temp1 = call ptr @strncat(ptr nonnull %str1, ptr nonnull %str2, i32 %n)61 ret ptr %temp162}63 64; strncat(x, y, 0) -> x65define ptr @test2(ptr %str1, ptr %str2, i32 %n) {66; CHECK-LABEL: @test2(67; CHECK-NEXT: ret ptr [[STR1:%.*]]68;69 70 %temp1 = call ptr @strncat(ptr %str1, ptr %str2, i32 0)71 ret ptr %temp172}73 74; strncat(x, y, 5) -> strncat(nonnull x, nonnull y, 5)75define ptr @test3(ptr %str1, ptr %str2, i32 %n) {76; CHECK-LABEL: @test3(77; CHECK-NEXT: [[TEMP1:%.*]] = call ptr @strncat(ptr noundef nonnull dereferenceable(1) [[STR1:%.*]], ptr noundef nonnull dereferenceable(1) [[STR2:%.*]], i32 5)78; CHECK-NEXT: ret ptr [[TEMP1]]79;80 81 %temp1 = call ptr @strncat(ptr %str1, ptr %str2, i32 5)82 ret ptr %temp183}84 85define ptr @test4(ptr %str1, ptr %str2, i32 %n) null_pointer_is_valid {86; CHECK-LABEL: @test4(87; CHECK-NEXT: [[TEMP1:%.*]] = call ptr @strncat(ptr noundef [[STR1:%.*]], ptr [[STR2:%.*]], i32 [[N:%.*]])88; CHECK-NEXT: ret ptr [[TEMP1]]89;90 91 %temp1 = call ptr @strncat(ptr %str1, ptr %str2, i32 %n)92 ret ptr %temp193}94 95define ptr @test5(ptr %str, i32 %n) {96; CHECK-LABEL: @test5(97; CHECK-NEXT: [[STRLEN:%.*]] = call i32 @strlen(ptr noundef nonnull dereferenceable(1) [[STR:%.*]])98; CHECK-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds i8, ptr [[STR]], i32 [[STRLEN]]99; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(6) [[ENDPTR]], ptr noundef nonnull align 1 dereferenceable(6) @hello, i32 6, i1 false)100; CHECK-NEXT: ret ptr [[STR]]101;102 %temp1 = call ptr @strncat(ptr %str, ptr @hello, i32 10)103 ret ptr %temp1104}105