| Chris Lattner | f5b6bc7 | 2009-04-12 05:06:39 +0000 | [diff] [blame] | 1 | ; Test that the StrNCpyOptimizer works correctly |
| 2 | ; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | \ |
| 3 | ; RUN: not grep {call.*strncpy} |
| 4 | |
| Dan Gohman | 600d52c | 2009-08-19 23:18:49 +0000 | [diff] [blame^] | 5 | ; This transformation requires the pointer size, as it assumes that size_t is |
| 6 | ; the size of a pointer. |
| 7 | target datalayout = "-p:64:64:64" |
| 8 | |
| Chris Lattner | f5b6bc7 | 2009-04-12 05:06:39 +0000 | [diff] [blame] | 9 | @hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1] |
| 10 | @null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1] |
| 11 | @null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1] |
| 12 | |
| 13 | declare i8* @strncpy(i8*, i8*, i32) |
| 14 | |
| 15 | declare i32 @puts(i8*) |
| 16 | |
| 17 | define i32 @main() { |
| 18 | %target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1] |
| 19 | %arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2] |
| 20 | store i8 0, i8* %arg1 |
| 21 | %arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1] |
| 22 | %rslt1 = call i8* @strncpy( i8* %arg1, i8* %arg2, i32 6 ) ; <i8*> [#uses=1] |
| 23 | %arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1] |
| 24 | %rslt2 = call i8* @strncpy( i8* %rslt1, i8* %arg3, i32 42 ) ; <i8*> [#uses=1] |
| 25 | %arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1] |
| 26 | %rslt3 = call i8* @strncpy( i8* %rslt2, i8* %arg4, i32 42 ) ; <i8*> [#uses=1] |
| 27 | call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0] |
| 28 | ret i32 0 |
| 29 | } |