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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 an excessive size to memchr() isn't truncated to an in-bounds5; value that results in the call being incorrectly folded (as might happen6; when LLVM is compiled in ILP32 mode).7 8declare ptr @memchr(ptr, i32, i64)9 10@ax = external global [0 x i8]11@a12345 = constant [5 x i8] c"\01\02\03\04\05"12 13 14; Do not fold memchr(ax, 1, UINT_MAX + (size_t)1) to null. Only the first15; byte in ax must be dereferenceable.16 17define ptr @call_memchr_ax_2_uimax_p1() {18; CHECK-LABEL: @call_memchr_ax_2_uimax_p1(19; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @ax, i32 1, i64 4294967296)20; CHECK-NEXT: ret ptr [[RES]]21;22 23 %res = call ptr @memchr(ptr @ax, i32 1, i64 4294967296)24 ret ptr %res25}26 27 28; Do not fold memchr(ax, 1, UINT_MAX + (size_t)2) to *ax == 1 ? ax : null.29; As above, only the first byte in ax must be dereferenceable.30 31define ptr @call_memchr_ax_2_uimax_p2() {32; CHECK-LABEL: @call_memchr_ax_2_uimax_p2(33; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @ax, i32 1, i64 4294967296)34; CHECK-NEXT: ret ptr [[RES]]35;36 37 %res = call ptr @memchr(ptr @ax, i32 1, i64 4294967296)38 ret ptr %res39}40 41 42; Fold memchr(a12345, 3, UINT_MAX + (size_t)2) to a12345 + 2 (and not to43; null).44 45define ptr @fold_memchr_a12345_3_uimax_p2() {46; CHECK-LABEL: @fold_memchr_a12345_3_uimax_p2(47; CHECK-NEXT: ret ptr getelementptr inbounds nuw (i8, ptr @a12345, i64 2)48;49 50 %res = call ptr @memchr(ptr @a12345, i32 3, i64 4294967297)51 ret ptr %res52}53 54 55; Do not fold memchr(a12345, c, UINT_MAX + (size_t)2).56 57define ptr @fold_memchr_a12345_c_uimax_p2(i32 %0) {58; CHECK-LABEL: @fold_memchr_a12345_c_uimax_p2(59; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @a12345, i32 [[TMP0:%.*]], i64 4294967297)60; CHECK-NEXT: ret ptr [[RES]]61;62 63 %res = call ptr @memchr(ptr @a12345, i32 %0, i64 4294967297)64 ret ptr %res65}66