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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129736 91177308-0d34-0410-b5e6-96231b3b80d8
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<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
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+<h1>
LLVM Link Time Optimization: Design and Implementation
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<ul>
<li><a href="#desc">Description</a></li>
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</div>
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<a name="desc">Description</a>
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<a name="design">Design Philosophy</a>
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</div>
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<a name="example1">Example of link time optimization</a>
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<div class="doc_text">
<p>The following example illustrates the advantages of LTO's integrated
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</div>
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+<h3>
<a name="alternative_approaches">Alternative Approaches</a>
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<dl>
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</div>
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<a name="multiphase">Multi-phase communication between libLTO and linker</a>
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<div class="doc_text">
<p>The linker collects information about symbol defininitions and uses in
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</div>
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<a name="phase1">Phase 1 : Read LLVM Bitcode Files</a>
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<div class="doc_text">
<p>The linker first reads all object files in natural order and collects
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</div>
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<a name="phase2">Phase 2 : Symbol Resolution</a>
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<p>In this stage, the linker resolves symbols using global symbol table.
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</div>
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<a name="phase3">Phase 3 : Optimize Bitcode Files</a>
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<div class="doc_text">
<p>After symbol resolution, the linker tells the LTO shared object which
symbols are needed by native object files. In the example above, the linker
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</div>
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<a name="phase4">Phase 4 : Symbol Resolution after optimization</a>
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<div class="doc_text">
<p>In this phase, the linker reads optimized a native object file and
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</div>
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+<h2>
<a name="lto">libLTO</a>
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<p><tt>libLTO</tt> is a shared object that is part of the LLVM tools, and
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</div>
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<a name="lto_module_t">lto_module_t</a>
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</div>
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<a name="lto_code_gen_t">lto_code_gen_t</a>
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<div class="doc_text">