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      1 ; This test checks to make sure that constant exprs don't fold in some simple
      2 ; situations
      3 
      4 ; RUN: llvm-as < %s | llvm-dis | FileCheck %s
      5 ; RUN: verify-uselistorder %s
      6 
      7 ; Even give it a datalayout, to tempt folding as much as possible.
      8 target datalayout = "p:32:32"
      9 
     10 @A = global i64 0
     11 @B = global i64 0
     12 
     13 ; Don't fold this. @A might really be allocated next to @B, in which case the
     14 ; icmp should return true. It's not valid to *dereference* in @B from a pointer
     15 ; based on @A, but icmp isn't a dereference.
     16 
     17 ; CHECK: @C = global i1 icmp eq (i64* getelementptr inbounds (i64, i64* @A, i64 1), i64* @B)
     18 @C = global i1 icmp eq (i64* getelementptr inbounds (i64, i64* @A, i64 1), i64* @B)
     19 
     20 ; Don't fold this completely away either. In theory this could be simplified
     21 ; to only use a gep on one side of the icmp though.
     22 
     23 ; CHECK: @D = global i1 icmp eq (i64* getelementptr inbounds (i64, i64* @A, i64 1), i64* getelementptr inbounds (i64, i64* @B, i64 2))
     24 @D = global i1 icmp eq (i64* getelementptr inbounds (i64, i64* @A, i64 1), i64* getelementptr inbounds (i64, i64* @B, i64 2))
     25 
     26 ; CHECK: @E = global i64 addrspace(1)* addrspacecast (i64* @A to i64 addrspace(1)*)
     27 @E = global i64 addrspace(1)* addrspacecast(i64* @A to i64 addrspace(1)*)
     28 
     29 ; Don't add an inbounds on @weak.gep, since @weak may be null.
     30 ; CHECK: @weak.gep = global i32* getelementptr (i32, i32* @weak, i32 1)
     31 @weak.gep = global i32* getelementptr (i32, i32* @weak, i32 1)
     32 @weak = extern_weak global i32
     33 
     34 ; An object with weak linkage cannot have it's identity determined at compile time.
     35 ; CHECK: @F = global i1 icmp eq (i32* @weakany, i32* @glob)
     36 @F = global i1 icmp eq (i32* @weakany, i32* @glob)
     37 @weakany = weak global i32 0
     38 
     39 ; Empty globals might end up anywhere, even on top of another global.
     40 ; CHECK: @empty.cmp = global i1 icmp eq ([0 x i8]* @empty.1, [0 x i8]* @empty.2)
     41 @empty.1 = external global [0 x i8], align 1
     42 @empty.2 = external global [0 x i8], align 1
     43 @empty.cmp = global i1 icmp eq ([0 x i8]* @empty.1, [0 x i8]* @empty.2)
     44 
     45 ; Don't add an inbounds on @glob.a3, since it's not inbounds.
     46 ; CHECK: @glob.a3 = alias i32, getelementptr (i32, i32* @glob.a2, i32 1)
     47 @glob = global i32 0
     48 @glob.a3 = alias i32, getelementptr (i32, i32* @glob.a2, i32 1)
     49 @glob.a2 = alias i32, getelementptr (i32, i32* @glob.a1, i32 1)
     50 @glob.a1 = alias i32, i32* @glob
     51