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authorNAKAMURA Takumi <geek4civic@gmail.com>2011-04-18 23:59:50 +0000
committerNAKAMURA Takumi <geek4civic@gmail.com>2011-04-18 23:59:50 +0000
commit05d0265fef651de152c8127aa701e689555649f3 (patch)
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parent1f48a95ccbff731a8bcf4890204e5eef09eb99d1 (diff)
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@@ -6,9 +6,9 @@
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
-<div class="doc_title">
+<h1>
LLVM Link Time Optimization: Design and Implementation
-</div>
+</h1>
<ul>
<li><a href="#desc">Description</a></li>
@@ -36,9 +36,9 @@
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="desc">Description</a>
-</div>
+</h2>
<!-- *********************************************************************** -->
<div class="doc_text">
@@ -50,9 +50,9 @@ and design between the LTO optimizer and the linker.</p>
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="design">Design Philosophy</a>
-</div>
+</h2>
<!-- *********************************************************************** -->
<div class="doc_text">
@@ -72,9 +72,9 @@ conservative escape analysis.
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="example1">Example of link time optimization</a>
-</div>
+</h3>
<div class="doc_text">
<p>The following example illustrates the advantages of LTO's integrated
@@ -145,9 +145,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="alternative_approaches">Alternative Approaches</a>
-</div>
+</h3>
<div class="doc_text">
<dl>
@@ -176,9 +176,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="multiphase">Multi-phase communication between libLTO and linker</a>
-</div>
+</h2>
<div class="doc_text">
<p>The linker collects information about symbol defininitions and uses in
@@ -195,9 +195,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="phase1">Phase 1 : Read LLVM Bitcode Files</a>
-</div>
+</h3>
<div class="doc_text">
<p>The linker first reads all object files in natural order and collects
@@ -219,9 +219,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="phase2">Phase 2 : Symbol Resolution</a>
-</div>
+</h3>
<div class="doc_text">
<p>In this stage, the linker resolves symbols using global symbol table.
@@ -233,9 +233,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="phase3">Phase 3 : Optimize Bitcode Files</a>
-</div>
+</h3>
<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
@@ -248,9 +248,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="phase4">Phase 4 : Symbol Resolution after optimization</a>
-</div>
+</h3>
<div class="doc_text">
<p>In this phase, the linker reads optimized a native object file and
@@ -265,9 +265,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
<a name="lto">libLTO</a>
-</div>
+</h2>
<div class="doc_text">
<p><tt>libLTO</tt> is a shared object that is part of the LLVM tools, and
@@ -281,9 +281,9 @@ $ llvm-gcc a.o main.o -o main # &lt;-- standard link command without any modific
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="lto_module_t">lto_module_t</a>
-</div>
+</h3>
<div class="doc_text">
@@ -325,9 +325,9 @@ lto_module_get_symbol_attribute(lto_module_t, unsigned int)
</div>
<!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
<a name="lto_code_gen_t">lto_code_gen_t</a>
-</div>
+</h3>
<div class="doc_text">