1; Tests to make sure elimination of casts is working correctly
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4target datalayout = "p:32:32"
5
6; This shouldn't convert to getelementptr because the relationship
7; between the arithmetic and the layout of allocated memory is
8; entirely unknown.
9; CHECK-LABEL: @test1(
10; CHECK: ptrtoint
11; CHECK: add
12; CHECK: inttoptr
13define i8* @test1(i8* %t) {
14        %tmpc = ptrtoint i8* %t to i32          ; <i32> [#uses=1]
15        %tmpa = add i32 %tmpc, 32               ; <i32> [#uses=1]
16        %tv = inttoptr i32 %tmpa to i8*         ; <i8*> [#uses=1]
17        ret i8* %tv
18}
19
20; These casts should be folded away.
21; CHECK-LABEL: @test2(
22; CHECK: icmp eq i8* %a, %b
23define i1 @test2(i8* %a, i8* %b) {
24        %tmpa = ptrtoint i8* %a to i32          ; <i32> [#uses=1]
25        %tmpb = ptrtoint i8* %b to i32          ; <i32> [#uses=1]
26        %r = icmp eq i32 %tmpa, %tmpb           ; <i1> [#uses=1]
27        ret i1 %r
28}
29
30; These casts should also be folded away.
31; CHECK-LABEL: @test3(
32; CHECK: icmp eq i8* %a, @global
33@global = global i8 0
34define i1 @test3(i8* %a) {
35        %tmpa = ptrtoint i8* %a to i32
36        %r = icmp eq i32 %tmpa, ptrtoint (i8* @global to i32)
37        ret i1 %r
38}
39
40define i1 @test4(i32 %A) {
41  %B = inttoptr i32 %A to i8*
42  %C = icmp eq i8* %B, null
43  ret i1 %C
44; CHECK-LABEL: @test4(
45; CHECK-NEXT: %C = icmp eq i32 %A, 0
46; CHECK-NEXT: ret i1 %C 
47}
48
49
50; Pulling the cast out of the load allows us to eliminate the load, and then 
51; the whole array.
52
53        %op = type { float }
54        %unop = type { i32 }
55@Array = internal constant [1 x %op* (%op*)*] [ %op* (%op*)* @foo ]             ; <[1 x %op* (%op*)*]*> [#uses=1]
56
57declare %op* @foo(%op* %X)
58
59define %unop* @test5(%op* %O) {
60        %tmp = load %unop* (%op*)** bitcast ([1 x %op* (%op*)*]* @Array to %unop* (%op*)**); <%unop* (%op*)*> [#uses=1]
61        %tmp.2 = call %unop* %tmp( %op* %O )            ; <%unop*> [#uses=1]
62        ret %unop* %tmp.2
63; CHECK-LABEL: @test5(
64; CHECK: call %op* @foo(%op* %O)
65}
66
67
68
69; InstCombine can not 'load (cast P)' -> cast (load P)' if the cast changes
70; the address space.
71
72define i8 @test6(i8 addrspace(1)* %source) {                                                                                        
73entry: 
74  %arrayidx223 = bitcast i8 addrspace(1)* %source to i8*
75  %tmp4 = load i8* %arrayidx223
76  ret i8 %tmp4
77; CHECK-LABEL: @test6(
78; CHECK: load i8* %arrayidx223
79} 
80