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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt < %s -passes=instcombine -S | FileCheck %s3;4; Verify that memrchr calls with an out of bounds size are not folded to5; null (they might be intercepted by sanitizers).6 7declare ptr @memrchr(ptr, i32, i64)8 9@ax = external global [0 x i8]10@ax1 = external global [1 x i8]11@a12345 = constant [5 x i8] c"\01\02\03\04\05"12 13 14; Do not fold memrchr(a12345, C, UINT32_MAX + 1LU) to null or to a1234515; as might happen if the size were to be truncated to int32_t.16 17define ptr @call_memrchr_a12345_c_ui32max_p1(i32 %C) {18; CHECK-LABEL: @call_memrchr_a12345_c_ui32max_p1(19; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967296) @a12345, i32 [[C:%.*]], i64 4294967296)20; CHECK-NEXT: ret ptr [[RET]]21;22 23 %ret = call ptr @memrchr(ptr @a12345, i32 %C, i64 4294967296)24 ret ptr %ret25}26 27 28; Do not fold memrchr(ax1, C, UINT32_MAX + 2LU) to null or to *ax1 == 1.29 30define ptr @call_memrchr_ax1_c_ui32max_p2(i32 %C) {31; CHECK-LABEL: @call_memrchr_ax1_c_ui32max_p2(32; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967297) @ax1, i32 [[C:%.*]], i64 4294967297)33; CHECK-NEXT: ret ptr [[RET]]34;35 36 %ret = call ptr @memrchr(ptr @ax1, i32 %C, i64 4294967297)37 ret ptr %ret38}39 40 41; Do not fold memrchr(ax, C, UINT32_MAX + 2LU) to *ax == 1.42 43define ptr @call_memrchr_ax_c_ui32max_p2(i32 %C) {44; CHECK-LABEL: @call_memrchr_ax_c_ui32max_p2(45; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967297) @ax, i32 [[C:%.*]], i64 4294967297)46; CHECK-NEXT: ret ptr [[RET]]47;48 49 %ret = call ptr @memrchr(ptr @ax, i32 %C, i64 4294967297)50 ret ptr %ret51}52 53 54; Do not fold memrchr(a12345, C, 6) to null.55 56define ptr @call_memrchr_a12345_c_6(i32 %C) {57; CHECK-LABEL: @call_memrchr_a12345_c_6(58; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(6) @a12345, i32 [[C:%.*]], i64 6)59; CHECK-NEXT: ret ptr [[RET]]60;61 62 %ret = call ptr @memrchr(ptr @a12345, i32 %C, i64 6)63 ret ptr %ret64}65 66 67; Do not fold memrchr(a12345, C, SIZE_MAX) to null.68 69define ptr @call_memrchr_a12345_c_szmax(i32 %C) {70; CHECK-LABEL: @call_memrchr_a12345_c_szmax(71; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(18446744073709551615) @a12345, i32 [[C:%.*]], i64 -1)72; CHECK-NEXT: ret ptr [[RET]]73;74 75 %ret = call ptr @memrchr(ptr @a12345, i32 %C, i64 18446744073709551615)76 ret ptr %ret77}78