1 ; Test lib call simplification of __strcpy_chk calls with various values
2 ; for src, dst, and slen.
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
6 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"
8 @a = common global [60 x i8] zeroinitializer, align 1
9 @b = common global [60 x i8] zeroinitializer, align 1
10 @.str = private constant [12 x i8] c"abcdefghijk\00"
12 ; Check cases where slen >= strlen (src).
14 define void @test_simplify1() {
15 ; CHECK-LABEL: @test_simplify1(
16 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
17 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
19 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
20 call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 60)
24 define void @test_simplify2() {
25 ; CHECK-LABEL: @test_simplify2(
26 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
27 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
29 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
30 call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 12)
34 define void @test_simplify3() {
35 ; CHECK-LABEL: @test_simplify3(
36 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
37 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
39 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32
40 call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
44 ; Check cases where there are no string constants.
46 define void @test_simplify4() {
47 ; CHECK-LABEL: @test_simplify4(
48 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
49 %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
51 ; CHECK-NEXT: call i8* @strcpy
52 call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1)
56 ; Check case where the string length is not constant.
58 define void @test_simplify5() {
59 ; CHECK-LABEL: @test_simplify5(
60 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
61 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0
63 ; CHECK: @__memcpy_chk
64 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false)
65 call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 %len)
69 ; Check case where the source and destination are the same.
71 define i8* @test_simplify6() {
72 ; CHECK-LABEL: @test_simplify6(
73 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
75 ; CHECK: getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0)
76 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false)
77 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %dst, i32 %len)
81 ; Check case where slen < strlen (src).
83 define void @test_no_simplify1() {
84 ; CHECK-LABEL: @test_no_simplify1(
85 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0
86 %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0
88 ; CHECK-NEXT: call i8* @__strcpy_chk
89 call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8)
93 declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind
94 declare i32 @llvm.objectsize.i32.p0i8(i8*, i1) nounwind readonly