1 ; This test makes sure that memmove instructions are properly eliminated.
3 ; RUN: opt < %s -instcombine -S | \
4 ; RUN: not grep {call void @llvm.memmove}
6 @S = internal constant [33 x i8] c"panic: restorelist inconsistency\00" ; <[33 x i8]*> [#uses=1]
7 @h = constant [2 x i8] c"h\00" ; <[2 x i8]*> [#uses=1]
8 @hel = constant [4 x i8] c"hel\00" ; <[4 x i8]*> [#uses=1]
9 @hello_u = constant [8 x i8] c"hello_u\00" ; <[8 x i8]*> [#uses=1]
12 declare void @llvm.memmove.i32(i8*, i8*, i32, i32)
14 define void @test1(i8* %A, i8* %B, i32 %N) {
15 call void @llvm.memmove.i32( i8* %A, i8* %B, i32 0, i32 1 )
19 define void @test2(i8* %A, i32 %N) {
20 ;; dest can't alias source since we can't write to source!
21 call void @llvm.memmove.i32( i8* %A, i8* getelementptr ([33 x i8]* @S, i32 0, i32 0), i32 %N, i32 1 )
26 %h_p = getelementptr [2 x i8]* @h, i32 0, i32 0 ; <i8*> [#uses=1]
27 %hel_p = getelementptr [4 x i8]* @hel, i32 0, i32 0 ; <i8*> [#uses=1]
28 %hello_u_p = getelementptr [8 x i8]* @hello_u, i32 0, i32 0 ; <i8*> [#uses=1]
29 %target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
30 %target_p = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=3]
31 call void @llvm.memmove.i32( i8* %target_p, i8* %h_p, i32 2, i32 2 )
32 call void @llvm.memmove.i32( i8* %target_p, i8* %hel_p, i32 4, i32 4 )
33 call void @llvm.memmove.i32( i8* %target_p, i8* %hello_u_p, i32 8, i32 8 )
38 define void @test4(i8* %a) {
39 tail call void @llvm.memmove.i32( i8* %a, i8* %a, i32 100, i32 1 )