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First step in fixing PR8927:

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Add a unnamed_addr bit to global variables and functions. This will be used
to indicate that the address is not significant and therefore the constant
or function can be merged with others.

If an optimization pass can show that an address is not used, it can set this.

Examples of things that can have this set by the FE are globals created to
hold string literals and C++ constructors.

Adding unnamed_addr to a non-const global should have no effect unless
an optimization can transform that global into a constant.

Aliases are not allowed to have unnamed_addr since I couldn't figure
out any use for it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2011-01-08 16:42:36 +00:00
parent 8368ac3688
commit bea4626f93
12 changed files with 98 additions and 13 deletions
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7
docs/BitCodeFormat.html
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@ -922,6 +922,9 @@ encoding of the visibility of this variable:
<li><i>threadlocal</i>: If present and non-zero, indicates that the variable
is <tt>thread_local</tt></li>
<li><i>unnamed_addr</i>: If present and non-zero, indicates that the variable
has <tt>unnamed_addr<tt></li>
</ul>
</div>
@ -975,6 +978,10 @@ entries.</li>
<li><i>gc</i>: If present and nonzero, the 1-based garbage collector
index in the table of
<a href="#MODULE_CODE_GCNAME">MODULE_CODE_GCNAME</a> entries.</li>
<li><i>unnamed_addr</i>: If present and non-zero, indicates that the function
has <tt>unnamed_addr<tt></li>
</ul>
</div>