1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test lib call simplification of __strncpy_chk calls with various values
5 ; RUN: opt < %s -instcombine -S | FileCheck %s
7 target 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"
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"
13 ; Check cases where dstlen >= len
15 define i8* @test_simplify1() {
16 ; CHECK-LABEL: @test_simplify1(
17 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(12) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* nonnull align 1 dereferenceable(12) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
18 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
20 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
21 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
23 %ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60)
27 define i8* @test_simplify2() {
28 ; CHECK-LABEL: @test_simplify2(
29 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(12) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* nonnull align 1 dereferenceable(12) getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
30 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
32 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
33 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
35 %ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 12)
39 define i8* @test_simplify3() {
40 ; CHECK-LABEL: @test_simplify3(
41 ; CHECK-NEXT: [[STRNCPY:%.*]] = call i8* @strncpy(i8* nonnull dereferenceable(1) getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* nonnull dereferenceable(1) getelementptr inbounds ([60 x i8], [60 x i8]* @b, i32 0, i32 0), i32 12)
42 ; CHECK-NEXT: ret i8* [[STRNCPY]]
44 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
45 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
47 %ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60)
51 ; Check cases where dstlen < len
53 define i8* @test_no_simplify1() {
54 ; CHECK-LABEL: @test_no_simplify1(
55 ; CHECK-NEXT: [[RET:%.*]] = call i8* @__strncpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 8, i32 4)
56 ; CHECK-NEXT: ret i8* [[RET]]
58 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
59 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
61 %ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 4)
65 define i8* @test_no_simplify2() {
66 ; CHECK-LABEL: @test_no_simplify2(
67 ; CHECK-NEXT: [[RET:%.*]] = call i8* @__strncpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @b, i32 0, i32 0), i32 8, i32 0)
68 ; CHECK-NEXT: ret i8* [[RET]]
70 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
71 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
73 %ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 0)
77 declare i8* @__strncpy_chk(i8*, i8*, i32, i32)