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Rafael Espindola f907a26bc2 Change the .ll syntax for comdats and add a syntactic sugar.

In order to make comdats always explicit in the IR, we decided to make
the syntax a bit more compact for the case of a GlobalObject in a
comdat with the same name.

Just dropping the $name causes problems for

@foo = globabl i32 0, comdat
$bar = comdat ...

and

declare void @foo() comdat
$bar = comdat ...

So the syntax is changed to

@g1 = globabl i32 0, comdat($c1)
@g2 = globabl i32 0, comdat

and

declare void @foo() comdat($c1)
declare void @foo() comdat

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225302 91177308-0d34-0410-b5e6-96231b3b80d8

2015-01-06 22:55:16 +00:00

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 ; RUN: not llvm-link %s %p/Inputs/comdat8.ll -S -o - 2>&1 | FileCheck %s
 $c1 = comdat largest
 @some_name = private unnamed_addr constant i32 42, comdat($c1)
 @c1 = alias i8* inttoptr (i32 ptrtoint (i32* @some_name to i32) to i8*)
 ; CHECK: COMDAT key involves incomputable alias size.