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c8a1169c93
This new IR facility allows us to represent the object-file semantic of a COMDAT group. COMDATs allow us to tie together sections and make the inclusion of one dependent on another. This is required to implement features like MS ABI VFTables and optimizing away certain kinds of initialization in C++. This functionality is only representable in COFF and ELF, Mach-O has no similar mechanism. Differential Revision: http://reviews.llvm.org/D4178 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211920 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
788 B
LLVM
33 lines
788 B
LLVM
; RUN: llvm-link %s %p/Inputs/comdat.ll -S -o - | FileCheck %s
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target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
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target triple = "i686-pc-windows-msvc"
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$foo = comdat largest
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@foo = global i32 42, comdat $foo
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define i32 @bar() comdat $foo {
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ret i32 42
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}
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$qux = comdat largest
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@qux = global i64 12, comdat $qux
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define i32 @baz() comdat $qux {
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ret i32 12
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}
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$any = comdat any
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@any = global i64 6, comdat $any
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; CHECK: $qux = comdat largest
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; CHECK: $foo = comdat largest
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; CHECK: $any = comdat any
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; CHECK: @qux = global i64 12, comdat $qux
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; CHECK: @any = global i64 6, comdat $any
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; CHECK: @foo = global i64 43, comdat $foo
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; CHECK-NOT: @in_unselected_group = global i32 13, comdat $qux
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; CHECK: define i32 @baz() comdat $qux
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; CHECK: define i32 @bar() comdat $foo
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