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comparison test/Transforms/InstCombine/strcat-1.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children afa8332a0e37
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-1:000000000000 0:95c75e76d11b
1 ; Test that the strcat libcall simplifier works correctly per the
2 ; bug found in PR3661.
3 ;
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
5
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"
7
8 @hello = constant [6 x i8] c"hello\00"
9 @null = constant [1 x i8] zeroinitializer
10 @null_hello = constant [7 x i8] c"\00hello\00"
11
12 declare i8* @strcat(i8*, i8*)
13 declare i32 @puts(i8*)
14
15 define i32 @main() {
16 ; CHECK-LABEL: @main(
17 ; CHECK-NOT: call i8* @strcat
18 ; CHECK: call i32 @puts
19
20 %target = alloca [1024 x i8]
21 %arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
22 store i8 0, i8* %arg1
23
24 ; rslt1 = strcat(target, "hello\00")
25 %arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
26 %rslt1 = call i8* @strcat(i8* %arg1, i8* %arg2)
27
28 ; rslt2 = strcat(rslt1, "\00")
29 %arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0
30 %rslt2 = call i8* @strcat(i8* %rslt1, i8* %arg3)
31
32 ; rslt3 = strcat(rslt2, "\00hello\00")
33 %arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0
34 %rslt3 = call i8* @strcat(i8* %rslt2, i8* %arg4)
35
36 call i32 @puts( i8* %rslt3 )
37 ret i32 0
38 }