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If a local_unnamed_addr attribute is attached to a global, the address is known to be insignificant within the module. It is distinct from the existing unnamed_addr attribute in that it only describes a local property of the module rather than a global property of the symbol. This attribute is intended to be used by the code generator and LTO to allow the linker to decide whether the global needs to be in the symbol table. It is possible to exclude a global from the symbol table if three things are true: - This attribute is present on every instance of the global (which means that the normal rule that the global must have a unique address can be broken without being observable by the program by performing comparisons against the global's address) - The global has linkonce_odr linkage (which means that each linkage unit must have its own copy of the global if it requires one, and the copy in each linkage unit must be the same) - It is a constant or a function (which means that the program cannot observe that the unique-address rule has been broken by writing to the global) Although this attribute could in principle be computed from the module contents, LTO clients (i.e. linkers) will normally need to be able to compute this property as part of symbol resolution, and it would be inefficient to materialize every module just to compute it. See: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160509/356401.html http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160516/356738.html for earlier discussion. Part of the fix for PR27553. Differential Revision: http://reviews.llvm.org/D20348 llvm-svn: 272709
104 lines
3.5 KiB
LLVM
104 lines
3.5 KiB
LLVM
; RUN: opt < %s -S -globalopt | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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@.str91250 = global [3 x i8] zeroinitializer
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; CHECK: @A = local_unnamed_addr global i1 false
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@A = global i1 icmp ne (i64 sub nsw (i64 ptrtoint (i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str91250, i64 0, i64 1) to i64), i64 ptrtoint ([3 x i8]* @.str91250 to i64)), i64 1)
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; PR11352
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@xs = global [2 x i32] zeroinitializer, align 4
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; CHECK: @xs = local_unnamed_addr global [2 x i32] [i32 1, i32 1]
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; PR12642
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%PR12642.struct = type { i8 }
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@PR12642.s = global <{}> zeroinitializer, align 1
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@PR12642.p = constant %PR12642.struct* bitcast (i8* getelementptr (i8, i8* bitcast (<{}>* @PR12642.s to i8*), i64 1) to %PR12642.struct*), align 8
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define internal void @test1() {
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entry:
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store i32 1, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @xs, i64 0, i64 0)
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%0 = load i32, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @xs, i32 0, i64 0), align 4
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store i32 %0, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @xs, i64 0, i64 1)
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ret void
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}
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; PR12060
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%closure = type { i32 }
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@f = internal global %closure zeroinitializer, align 4
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@m = global i32 0, align 4
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; CHECK-NOT: @f
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; CHECK: @m = local_unnamed_addr global i32 13
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define internal i32 @test2_helper(%closure* %this, i32 %b) {
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entry:
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%0 = getelementptr inbounds %closure, %closure* %this, i32 0, i32 0
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%1 = load i32, i32* %0, align 4
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%add = add nsw i32 %1, %b
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ret i32 %add
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}
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define internal void @test2() {
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entry:
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store i32 4, i32* getelementptr inbounds (%closure, %closure* @f, i32 0, i32 0)
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%call = call i32 @test2_helper(%closure* @f, i32 9)
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store i32 %call, i32* @m, align 4
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ret void
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}
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; PR19955
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@dllimportptr = global i32* null, align 4
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; CHECK: @dllimportptr = local_unnamed_addr global i32* null, align 4
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@dllimportvar = external dllimport global i32
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define internal void @test3() {
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entry:
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store i32* @dllimportvar, i32** @dllimportptr, align 4
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ret void
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}
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@dllexportptr = global i32* null, align 4
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; CHECK: @dllexportptr = local_unnamed_addr global i32* @dllexportvar, align 4
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@dllexportvar = dllexport global i32 0, align 4
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; CHECK: @dllexportvar = dllexport global i32 20, align 4
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define internal void @test4() {
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entry:
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store i32 20, i32* @dllexportvar, align 4
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store i32* @dllexportvar, i32** @dllexportptr, align 4
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ret void
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}
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@threadlocalptr = global i32* null, align 4
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; CHECK: @threadlocalptr = global i32* null, align 4
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@threadlocalvar = external thread_local global i32
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define internal void @test5() {
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entry:
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store i32* @threadlocalvar, i32** @threadlocalptr, align 4
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ret void
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}
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@test6_v1 = internal global { i32, i32 } { i32 42, i32 0 }, align 8
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@test6_v2 = global i32 0, align 4
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; CHECK: @test6_v2 = local_unnamed_addr global i32 42, align 4
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define internal void @test6() {
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%load = load { i32, i32 }, { i32, i32 }* @test6_v1, align 8
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%xv0 = extractvalue { i32, i32 } %load, 0
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%iv = insertvalue { i32, i32 } %load, i32 %xv0, 1
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%xv1 = extractvalue { i32, i32 } %iv, 1
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store i32 %xv1, i32* @test6_v2, align 4
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ret void
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}
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@llvm.global_ctors = appending constant
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[6 x { i32, void ()* }]
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[{ i32, void ()* } { i32 65535, void ()* @test1 },
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{ i32, void ()* } { i32 65535, void ()* @test2 },
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{ i32, void ()* } { i32 65535, void ()* @test3 },
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{ i32, void ()* } { i32 65535, void ()* @test4 },
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{ i32, void ()* } { i32 65535, void ()* @test5 },
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{ i32, void ()* } { i32 65535, void ()* @test6 }]
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