Heuristic: If the number of operands in the alias are more than the number of
[llvm/stm8.git] / test / Transforms / SimplifyLibCalls / StrNCpy.ll
blobc8af3ca8c3e279e3f3f824cd46fe3df172a5133c
1 ; Test that the StrNCpyOptimizer works correctly
2 ; RUN: opt < %s -simplify-libcalls -S | \
3 ; RUN:   not grep {call.*strncpy}
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"
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]
13 declare i8* @strncpy(i8*, i8*, i32)
15 declare i32 @puts(i8*)
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