1ba5e9ac24
At least on ELF, it's impossible to tell from the object file whether two globals with the same section marking were merged: the merged global uses "private" linkage to hide its symbol, and the aliases look like regular symbols. I can't think of any other reason to disallow it. (Of course, we can only merge globals in the same section.) The weird alignment handling matches AsmPrinter; our alignment handling for global variables should probably be refactored. Differential Revision: https://reviews.llvm.org/D49822 llvm-svn: 338791
32 lines
1.5 KiB
LLVM
32 lines
1.5 KiB
LLVM
; RUN: opt -global-merge -global-merge-max-offset=100 -S -o - %s | FileCheck %s
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target datalayout = "e-p:64:64"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK: @_MergedGlobals = private global <{ i32, i32 }> <{ i32 3, i32 4 }>, section "foo", align 4
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; CHECK: @_MergedGlobals.1 = private global <{ i32, i32 }> <{ i32 1, i32 2 }>, align 4
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; CHECK-DAG: @a = internal alias i32, getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals.1, i32 0, i32 0)
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@a = internal global i32 1
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; CHECK-DAG: @b = internal alias i32, getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals.1, i32 0, i32 1)
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@b = internal global i32 2
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; CHECK-DAG: @c = internal alias i32, getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals, i32 0, i32 0)
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@c = internal global i32 3, section "foo"
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; CHECK-DAG: @d = internal alias i32, getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals, i32 0, i32 1)
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@d = internal global i32 4, section "foo"
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define void @use() {
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; CHECK: load i32, i32* getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals.1, i32 0, i32 0)
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%x = load i32, i32* @a
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; CHECK: load i32, i32* getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals.1, i32 0, i32 1)
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%y = load i32, i32* @b
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; CHECK: load i32, i32* getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals, i32 0, i32 0)
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%z1 = load i32, i32* @c
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; CHECK: load i32, i32* getelementptr inbounds (<{ i32, i32 }>, <{ i32, i32 }>* @_MergedGlobals, i32 0, i32 1)
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%z2 = load i32, i32* @d
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ret void
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}
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