1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; Test lib call simplification of __strncpy_chk calls with various values 3; for len and dstlen. 4; 5; RUN: opt < %s -passes=instcombine -S | FileCheck %s 6 7target 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" 8 9@a = common global [60 x i8] zeroinitializer, align 1 10@b = common global [60 x i8] zeroinitializer, align 1 11@.str = private constant [12 x i8] c"abcdefghijk\00" 12 13; Check cases where dstlen >= len 14 15define ptr @test_simplify1() { 16; CHECK-LABEL: @test_simplify1( 17; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(12) @a, ptr noundef nonnull align 1 dereferenceable(12) @.str, i32 12, i1 false) 18; CHECK-NEXT: ret ptr @a 19; 20 21 %ret = call ptr @__strncpy_chk(ptr @a, ptr @.str, i32 12, i32 60) 22 ret ptr %ret 23} 24 25define ptr @test_simplify2() { 26; CHECK-LABEL: @test_simplify2( 27; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr noundef nonnull align 1 dereferenceable(12) @a, ptr noundef nonnull align 1 dereferenceable(12) @.str, i32 12, i1 false) 28; CHECK-NEXT: ret ptr @a 29; 30 31 %ret = call ptr @__strncpy_chk(ptr @a, ptr @.str, i32 12, i32 12) 32 ret ptr %ret 33} 34 35define ptr @test_simplify3() { 36; CHECK-LABEL: @test_simplify3( 37; CHECK-NEXT: [[STRNCPY:%.*]] = call ptr @strncpy(ptr noundef nonnull dereferenceable(1) @a, ptr noundef nonnull dereferenceable(1) @b, i32 12) 38; CHECK-NEXT: ret ptr @a 39; 40 41 %ret = call ptr @__strncpy_chk(ptr @a, ptr @b, i32 12, i32 60) 42 ret ptr %ret 43} 44 45; Check cases where dstlen < len 46 47define ptr @test_no_simplify1() { 48; CHECK-LABEL: @test_no_simplify1( 49; CHECK-NEXT: [[RET:%.*]] = call ptr @__strncpy_chk(ptr nonnull @a, ptr nonnull @.str, i32 8, i32 4) 50; CHECK-NEXT: ret ptr [[RET]] 51; 52 53 %ret = call ptr @__strncpy_chk(ptr @a, ptr @.str, i32 8, i32 4) 54 ret ptr %ret 55} 56 57define ptr @test_no_simplify2() { 58; CHECK-LABEL: @test_no_simplify2( 59; CHECK-NEXT: [[RET:%.*]] = call ptr @__strncpy_chk(ptr nonnull @a, ptr nonnull @b, i32 8, i32 0) 60; CHECK-NEXT: ret ptr [[RET]] 61; 62 63 %ret = call ptr @__strncpy_chk(ptr @a, ptr @b, i32 8, i32 0) 64 ret ptr %ret 65} 66 67declare ptr @__strncpy_chk(ptr, ptr, i32, i32) 68