1 ; Test that the StrNCatOptimizer works correctly 2 ; RUN: opt < %s -simplify-libcalls -S | \ 3 ; RUN: not grep {call.*strncat} 4 ; RUN: opt < %s -simplify-libcalls -S | \ 5 ; RUN: grep {puts.*%arg1} 6 7 ; This transformation requires the pointer size, as it assumes that size_t is 8 ; the size of a pointer. 9 target datalayout = "-p:64:64:64" 10 11 @hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1] 12 @null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1] 13 @null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1] 14 15 declare i8* @strncat(i8*, i8*, i32) 16 17 declare i32 @puts(i8*) 18 19 define i32 @main() { 20 %target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1] 21 %arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2] 22 store i8 0, i8* %arg1 23 %arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1] 24 %rslt1 = call i8* @strncat( i8* %arg1, i8* %arg2, i32 6 ) ; <i8*> [#uses=1] 25 %arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1] 26 %rslt2 = call i8* @strncat( i8* %rslt1, i8* %arg3, i32 42 ) ; <i8*> [#uses=1] 27 %arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1] 28 %rslt3 = call i8* @strncat( i8* %rslt2, i8* %arg4, i32 42 ) ; <i8*> [#uses=1] 29 call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0] 30 ret i32 0 31 } 32
