1 ; Test that the strncat libcall simplifier works correctly. 2 ; 3 ; RUN: opt < %s -instcombine -S | FileCheck %s 4 5 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" 6 7 @hello = constant [6 x i8] c"hello\00" 8 @null = constant [1 x i8] zeroinitializer 9 @null_hello = constant [7 x i8] c"\00hello\00" 10 11 declare i8* @strncat(i8*, i8*, i32) 12 declare i32 @puts(i8*) 13 14 define i32 @main() { 15 ; CHECK-LABEL: @main( 16 ; CHECK-NOT: call i8* @strncat 17 ; CHECK: call i32 @puts 18 19 %target = alloca [1024 x i8] 20 %arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 21 store i8 0, i8* %arg1 22 23 ; rslt1 = strncat(target, "hello\00") 24 %arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 25 %rslt1 = call i8* @strncat(i8* %arg1, i8* %arg2, i32 6) 26 27 ; rslt2 = strncat(rslt1, "\00") 28 %arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 29 %rslt2 = call i8* @strncat(i8* %rslt1, i8* %arg3, i32 42) 30 31 ; rslt3 = strncat(rslt2, "\00hello\00") 32 %arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 33 %rslt3 = call i8* @strncat(i8* %rslt2, i8* %arg4, i32 42) 34 35 call i32 @puts(i8* %rslt3) 36 ret i32 0 37 } 38
