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8eef439528
A zero sized array is zero sized and might share its address with another global. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223684 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
2.2 KiB
LLVM
51 lines
2.2 KiB
LLVM
; This test checks to make sure that constant exprs don't fold in some simple
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; situations
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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; Even give it a datalayout, to tempt folding as much as possible.
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target datalayout = "p:32:32"
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@A = global i64 0
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@B = global i64 0
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; Don't fold this. @A might really be allocated next to @B, in which case the
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; icmp should return true. It's not valid to *dereference* in @B from a pointer
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; based on @A, but icmp isn't a dereference.
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; CHECK: @C = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* @B)
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@C = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* @B)
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; Don't fold this completely away either. In theory this could be simplified
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; to only use a gep on one side of the icmp though.
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; CHECK: @D = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* getelementptr inbounds (i64* @B, i64 2))
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@D = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* getelementptr inbounds (i64* @B, i64 2))
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; CHECK: @E = global i64 addrspace(1)* addrspacecast (i64* @A to i64 addrspace(1)*)
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@E = global i64 addrspace(1)* addrspacecast(i64* @A to i64 addrspace(1)*)
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; Don't add an inbounds on @weak.gep, since @weak may be null.
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; CHECK: @weak.gep = global i32* getelementptr (i32* @weak, i32 1)
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@weak.gep = global i32* getelementptr (i32* @weak, i32 1)
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@weak = extern_weak global i32
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; An object with weak linkage cannot have it's identity determined at compile time.
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; CHECK: @F = global i1 icmp eq (i32* @weakany, i32* @glob)
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@F = global i1 icmp eq (i32* @weakany, i32* @glob)
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@weakany = weak global i32 0
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; Empty globals might end up anywhere, even on top of another global.
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; CHECK: @empty.cmp = global i1 icmp eq ([0 x i8]* @empty.1, [0 x i8]* @empty.2)
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@empty.1 = external global [0 x i8], align 1
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@empty.2 = external global [0 x i8], align 1
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@empty.cmp = global i1 icmp eq ([0 x i8]* @empty.1, [0 x i8]* @empty.2)
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; Don't add an inbounds on @glob.a3, since it's not inbounds.
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; CHECK: @glob.a3 = alias getelementptr (i32* @glob.a2, i32 1)
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@glob = global i32 0
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@glob.a3 = alias getelementptr (i32* @glob.a2, i32 1)
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@glob.a2 = alias getelementptr (i32* @glob.a1, i32 1)
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@glob.a1 = alias i32* @glob
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